Reaction from the guy when he thinks Vergo is gonna attack with his left leg, only to troll and attack with his right ankle and he can't beleive it was that powerful to break him.
Against opponents that don't even make him use 5% of his strength Vergo doesn't even use haki, bamboo or punches, hell, he doesn't follow through with the momentum from his raised left leg but just gives an extended right leg ankle kick to signal Sanji that he ain't shit. No need to expend forces on trash not worthy of it