Was golden oozaru cumber's blast power what made Super Saiyan Blue Vegito defuse? In Dragon Ball Heroes anime episode 4, golden oozaru cumber fires a blast against Super Saiyan Blue Vegito and at that time Vegito defuses. Was golden oozaru cumber's blast power what made Super Saiyan Blue Vegito defuse or they are supposed to run out of fusion time exactly in that moment?
Based on how it seems to have happened i would say they run out of power, as Vegeta himeself has said it they simply have run out of energy(power). I do not think there is anything more to be said about it besides that.