Three moves, never more than three.
No matter if the opponent is strong or weak, regardless of whether Glakov is formidable, it's the same to Gao Yi—resolved in three moves or less.
Gao Yi doesn't even need to use a hammer. Using the hammer is just his way of fortifying his "Hammer God" persona tied to his restaurant.
Of course, using a hammer does have the effect of killing instantly. Judging by Glakov's build and size, his resistance to strikes should be good. Using fists and kicks might not guarantee a quick kill, but with a hammer, it's certain.
The defiant Glakov ultimately died at the hands of the unwavering Gao Yi, who never exceeded three moves.
Glakov, unwilling to accept defeat, challenged Gao Yi to smash his head open—and Gao Yi truly smashed his head open.
And how fast did it happen?
To put it simply, before a group of the world's best gunmen could even draw their weapons, everything was already over.
Invincibility isn't bragged about—it's proved through action.