After Frisk was trapped in the room, Gaster began to attack them several times. However, Sans came in and tried to protect Frisk, but he wasn't powerful enough to stop him. Then, Sans got the idea of absorbing Frisk's soul in order to defeat Gaster. Luckily, Sans and Frisk won the battle. Sans confronted Gaster and told him that killing others isn't the correct answer to get out of the Void. Gaster refuses to listen and attempts to attack Sans from behind, but Gaster gets impaled by bones before the attack had hit Sans. Gaster turns to Dust and Sans resets the timeline again.