How do I power punch (keyboard)?

[Lampglow]

There was a brief tutorial, but I didn't really get it. Hold... something. Heavy attack button immediately strikes, doesn't allow hold to power up. There's no in-game help feature I can find. I got this via Epic Store but no forums on there.

[leo_gear]

Hold the normal attack. It plays a charging animation that indicates when the charge is done. Then release the button.