diff --git a/src/phases/faint-phase.ts b/src/phases/faint-phase.ts
index 73a1d6487ca..414aa84ce6c 100644
--- a/src/phases/faint-phase.ts
+++ b/src/phases/faint-phase.ts
@@ -121,7 +121,7 @@ export class FaintPhase extends PokemonPhase {
     if (pokemon.turnData?.attacksReceived?.length) {
       const defeatSource = this.source;
 
-      if (defeatSource instanceof Pokemon && defeatSource.isOnField()) {
+      if (defeatSource?.isOnField()) {
         applyPostVictoryAbAttrs(PostVictoryAbAttr, defeatSource);
         const pvmove = allMoves[pokemon.turnData.attacksReceived[0].move];
         const pvattrs = pvmove.getAttrs(PostVictoryStatStageChangeAttr);
diff --git a/src/test/moves/fell_stinger.test.ts b/src/test/moves/fell_stinger.test.ts
index be39f51fb91..1b71a2ca642 100644
--- a/src/test/moves/fell_stinger.test.ts
+++ b/src/test/moves/fell_stinger.test.ts
@@ -35,14 +35,11 @@ describe("Moves - Fell Stinger", () => {
         Moves.LEECH_SEED
       ])
       .startingLevel(50)
-      .disableCrits();
-
-    game.override.enemyAbility(Abilities.STURDY)
+      .disableCrits()
+      .enemyAbility(Abilities.STURDY)
       .enemySpecies(Species.HYPNO)
-      .enemyMoveset([ Moves.SPLASH ])
+      .enemyMoveset(Moves.SPLASH)
       .enemyLevel(5);
-
-    game.override.weather(WeatherType.NONE);
   });
 
   it("should not grant stat boost if opponent gets KO'd by recoil", async () => {