itch.io

Months? Jeez... I can't tell if you're persistent or stubborn.

But if you haven't been able to figure it out in all this time, the best way of fighting them is to Present Yourself... and when they start grappling with you, try and "Resist" at the right time.

Pay attention to the dialogue, and to the enemy image... and you should be able to figure out when the right time to Resist is.
Do this repeatedly, and you'll eventually be able to beat him.