Wait... for Braggi to hit Brak for 16 points of damage, he would have had to have done 32 points of raw damage. The crit added 11, but that leaves 21 points of raw damage he would have had to have done. A greataxe does 12 damage max, so he has +9 to damage from somewhere? I'm just checking the math here. It probably doesn't matter because I am rolling really poorly, but I wanted to check.
I have to throw it. Normally, I would try to shove him, but since he is raging and stronger than I am, that is clearly not a good idea. So I'll throw it, which cancels out my advantage and imposes disadvantage. I'm not sure if I have that Inspiration point or not (since I already used one), but if so, I'll use it to cancel out the disadvantage.
[roll0] (or worse of [roll1] if disadvantage applies)
[roll2] piercing +[roll3] lightning