I was thinking when you cast the ult and start the fistfight, a little ice rink would spawn for you two to fight in but that seemed too outlandish lol.
Make Knockdown upgrade into a t4 item known as "Magic Piano" that turns the 1 hero stun from knockdown into an AOE stun in the form of a falling piano.
Noticed in games after yesterday's patch, sometimes the afterburn indicator on enemies doesnt properly fill up, making it hard to tell how many more hits it'll take til you proc the burn