undertale games

everyone gets teleported to a field with an amongus standing there (sans) where are we? (frisk) i dont know (chara) me neither (gaster) so what are the rules of this? (the guard says) the rules are that of you get defeated by the amongus we will shoot you all (toriel) WHAT (asgore) we have to fight the amongus then! (asriel) pulls out his fireballs to fight the amongus