Make Heavy Stun 10X more obvious by greying out all panels and putting a grey edge around the screen

So long as you insist on keeping Sprint's Heavy Stun in the game, it needs to be infinitely more obvious it's occuring.

Heavy Stun is so jarring because you don't even know it's happening half the time. You're madly clicking buttons wondering why you're taking so much damage and doing so little.

There's no clear indication that you have no control over your character for the 5 seconds.

At the very least, Heavy Stun should visually grey out all skills/panels that no longer accept input. But even that is too little. I suggest also adding a grey border around the screen, similar to the red border when getting low on life.