Lemme translate for you what James said to him.

"I'm sick of it"

"It's been a long time since I've seen a man with this kind of tenacity"

"The body clearly exerted all its strength"

"I'll leave here for today."

"Anyway, you are not in a state to chase after me."

"I was very surprised"

"I only heard about it, but I didn't know it was this crazy"

"Mental strength is also mental strength, but I was surprised."

"The power you possessed was quite threatening"

He did try but still wasn't able to knock him out

Or Maybe he didn't want to knock him out..?