Spoilers below.
I don't know what came over me, but 10 minutes later I was still punching the hell out of Zeus. The screen was all red and bloody already but I just kept punching. Partly, I didn't know when I should stop since the circle button kept popping up down there, but really I was laughing like a maniac as I punched on and on and on... Guess I hated the old man so much. I finally stopped when I got tired.