He hit him with the axe when the turret still attacked his ally and right before the ally stepped out of turret range so the turret did not refocus bc his ally was still in range (imagine me telling you this while i'm looking away from you with shiny glasses and closed eyes in a abime main charackter pose)
Almost three years ago he got a small rework, Ultimate base duration is 3 seconds but if he attacks or hits his E spell it refreshes the duration by 2.5 seconds, he can functionally stay CC immune throughout a whole fight as long as he’s hitting someone
