diff --git a/src/Infiltration/ui/GameTimer.tsx b/src/Infiltration/ui/GameTimer.tsx
index 894fe6111..e733ac8d0 100644
--- a/src/Infiltration/ui/GameTimer.tsx
+++ b/src/Infiltration/ui/GameTimer.tsx
@@ -1,5 +1,6 @@
 import React, { useEffect, useRef, useMemo } from "react";
 import { ProgressBar } from "../../ui/React/Progress";
+import { clampNumber } from "../../utils/helpers/clampNumber";
 
 type GameTimerProps = {
   endTimestamp: number;
@@ -14,7 +15,7 @@ export function GameTimer({ endTimestamp }: GameTimerProps): React.ReactElement
   // actually begin it until later. We're using a ref to keep this updated in
   // a very low-overhead way.
   const state = changeRef.current;
-  if (state?.endTimestamp !== endTimestamp) {
+  if (state.endTimestamp !== endTimestamp) {
     state.endTimestamp = endTimestamp;
     state.startTimestamp = performance.now();
   }
@@ -24,10 +25,12 @@ export function GameTimer({ endTimestamp }: GameTimerProps): React.ReactElement
     const ele = ref.current?.firstElementChild;
     const startTimestamp = changeRef.current.startTimestamp;
     if (!ele) return;
-    // The delay will be negative. This is because the animation starts
-    // partway completed, due to the time taken to invoke the effect.
     ele.animate([{ transform: "translateX(0%)" }, { transform: "translateX(-100%)" }], {
-      duration: endTimestamp - startTimestamp,
+      // If duration is negative, ele.animate will throw "TypeError: duration must be non-negative or auto". It may
+      // happen when the player uses the debugger.
+      duration: clampNumber(endTimestamp - startTimestamp, 0),
+      // The delay will be negative. This is because the animation starts
+      // partway completed, due to the time taken to invoke the effect.
       delay: startTimestamp - performance.now(),
     });
   }, [endTimestamp]);
diff --git a/src/Infiltration/ui/InfiltrationRoot.tsx b/src/Infiltration/ui/InfiltrationRoot.tsx
index e1d6063ce..c2ebf208f 100644
--- a/src/Infiltration/ui/InfiltrationRoot.tsx
+++ b/src/Infiltration/ui/InfiltrationRoot.tsx
@@ -33,7 +33,7 @@ interface StageProps {
 }
 
 // The extra cast here is needed because otherwise it sees the more-specific
-// types of the components, and gets grumpy that they are not interconvertable.
+// types of the components, and gets grumpy that they are not interconvertible.
 const stages = new Map([
   [IntroModel, Intro],
   [CountdownModel, Countdown],
@@ -51,6 +51,7 @@ const stages = new Map([
 function Progress({ results }: { results: string }): React.ReactElement {
   return (
     <Typography variant="h4">
+      {/* Only show the last 14 results instead of the full history. */}
       <span style={{ color: "gray" }}>{results.slice(-15, -1)}</span>
       {results[results.length - 1]}
     </Typography>
@@ -106,7 +107,7 @@ export function InfiltrationRoot(): React.ReactElement {
   return (
     <div style={{ display: "flex", alignItems: "center", height: "calc(100vh - 16px)" }}>
       {state.stage instanceof IntroModel ? (
-        <Intro state={state} stage={state.stage} />
+        <Intro state={state} />
       ) : (
         <Container>
           <Paper sx={{ p: 1, mb: 1, display: "grid", justifyItems: "center", gap: 1 }}>
diff --git a/src/Infiltration/ui/Intro.tsx b/src/Infiltration/ui/Intro.tsx
index 8d8242803..34bf4e842 100644
--- a/src/Infiltration/ui/Intro.tsx
+++ b/src/Infiltration/ui/Intro.tsx
@@ -4,7 +4,6 @@ import { Settings } from "../../Settings/Settings";
 import { formatHp, formatMoney, formatNumberNoSuffix, formatPercent, formatReputation } from "../../ui/formatNumber";
 import { Player } from "@player";
 import type { Infiltration } from "../Infiltration";
-import type { IntroModel } from "../model/IntroModel";
 import { calculateDamageAfterFailingInfiltration } from "../utils";
 import {
   calculateInfiltratorsRepReward,
@@ -18,7 +17,6 @@ import { useRerender } from "../../ui/React/hooks";
 
 interface IProps {
   state: Infiltration;
-  stage: IntroModel;
 }
 
 function arrowPart(color: string, length: number): JSX.Element {
diff --git a/src/Infiltration/ui/MinesweeperGame.tsx b/src/Infiltration/ui/MinesweeperGame.tsx
index 8d61bd28c..24f54328b 100644
--- a/src/Infiltration/ui/MinesweeperGame.tsx
+++ b/src/Infiltration/ui/MinesweeperGame.tsx
@@ -18,7 +18,7 @@ export function MinesweeperGame({ stage }: IProps): React.ReactElement {
   const flatGrid: { flagged?: boolean; current?: boolean; marked?: boolean }[] = [];
 
   stage.minefield.map((line, y) =>
-    line.map((cell, x) => {
+    line.map((_cell, x) => {
       if (stage.memoryPhase) {
         flatGrid.push({ flagged: Boolean(stage.minefield[y][x]) });
         return;
diff --git a/src/Locations/ui/CompanyLocation.tsx b/src/Locations/ui/CompanyLocation.tsx
index 2b6b15556..2b220da43 100644
--- a/src/Locations/ui/CompanyLocation.tsx
+++ b/src/Locations/ui/CompanyLocation.tsx
@@ -63,7 +63,7 @@ export function CompanyLocation(props: IProps): React.ReactElement {
       return;
     }
 
-    Player.startInfiltration(location);
+    Player.initInfiltration(location);
     Router.toPage(Page.Infiltration);
   }
 
diff --git a/src/PersonObjects/Player/PlayerObject.ts b/src/PersonObjects/Player/PlayerObject.ts
index 70d18aaab..d99b244ce 100644
--- a/src/PersonObjects/Player/PlayerObject.ts
+++ b/src/PersonObjects/Player/PlayerObject.ts
@@ -152,7 +152,7 @@ export class PlayerObject extends Person implements IPlayer {
   activeSourceFileLvl = generalMethods.activeSourceFileLvl;
   applyEntropy = augmentationMethods.applyEntropy;
   focusPenalty = generalMethods.focusPenalty;
-  startInfiltration = generalMethods.startInfiltration;
+  initInfiltration = generalMethods.initInfiltration;
 
   constructor() {
     super();
diff --git a/src/PersonObjects/Player/PlayerObjectGeneralMethods.ts b/src/PersonObjects/Player/PlayerObjectGeneralMethods.ts
index d87b0cc56..16619a3c0 100644
--- a/src/PersonObjects/Player/PlayerObjectGeneralMethods.ts
+++ b/src/PersonObjects/Player/PlayerObjectGeneralMethods.ts
@@ -603,7 +603,7 @@ export function focusPenalty(this: PlayerObject): number {
 }
 
 /** This doesn't change the current page; that is up to the caller. */
-export function startInfiltration(this: PlayerObject, location: Location): void {
+export function initInfiltration(this: PlayerObject, location: Location): void {
   if (!location.infiltrationData)
     throw new Error(`trying to start infiltration at ${location.name} but the infiltrationData is null`);
   this.infiltration = new Infiltration(location);