Board Thread:Questions and Answers/@comment-28898329-20160809202649/@comment-34285228-20170716194232

Mabian wrote: Because Flowey's philosophy of "kill or be killed" is still dominant. Asriel is still not quite Asriel properly speaking once he enters the battle. It takes the protagonist reaching out to him ("saving" him) to remind him and jumpstart his compassion again.

I don't find this as the anwser. He never says anything about that!

He thinks that Frisk is Chara, and wants to win against Frisk so that he can reset and do it again. He wants to do this because he doesn't want to lose Chara, even though Chara is already dead. Asriel fighting you is a component of his loneliness and fear.

PS: I didn't read anyone else's so, I'm sorry if anyone else said this. :3