After you escaped from Toriel, you slowly walked through the cold snow with your legs red from the cold, staggering but with the hope that maybe you could leave this hell called the dungeon, you felt that someone was watching you, suddenly you felt someone's presence behind you you, you saw a strange skeleton with a huge crack, it looked terrible

Weren't you taught how to greet an old friend?

he held out his hand looking into your soul with his terrible bloody eye