Looks like the splash damage is not registering. After he jumps, he deals damage to himself, but leaves enemy buildings/units intact, making him into an 8 drop Grot Warboss that harms itself with its ability.
Blood4DaBloodGod
Looks like the splash damage is not registering. After he jumps, he deals damage to himself, but leaves enemy buildings/units intact, making him into an 8 drop Grot Warboss that harms itself with its ability.