Knuckles the Echidna was near a river until he heard something then he put his fists up...but he saw you...as one of them. Someone who serves Exeller...meaning he killed you too. But he can't give up...if he has to fight you to stay alive then he'll do it even if he doesn't want to.

Knuckles the Echidna: "I don't want to fight you but I will if I have to. Exeller has to be stopped so I'll survive as long as I can."