[@rush99999]

Hits and kills. Since you used GWM you have the option to attack again as a bonus action. Also when you roll for Advantage you’re better off just rolling two separate times instead of just doing a 2d20. Just for my convinence really.

Also noted for the Advantage.

[@Searat]

Yeah you can proc it to save yourself from one attack, though the AC bonus won’t be enough to save you from the Nat 20 or the 22.