Hai i want to ask about Lightning Main Arena Prowess ( Increase att and Nin 12% everytime unit is defeated )

I tried in arena with :

Kabuto Snake Cloack Passive : everytime unit is defeated recover 10 chakra & recover 10 % hp

Hidan : if unit defeat every 2 round will resurect

kabuto using standard attack summon dead soul and defeated i can see kabuto will tirgger his passive but my main doesnt trigger his passive and everytimme my hidan is defeated it doesnt trigger too.

can anyone explain it? this skill error bug or somethin?