I think this would be an awesome way to turn a game around. blowing up one's own walker to finish off 3 or 4 enemies to keep them from snowballing would make for fun moments. explode a few, go mid when friendly team respawns, push lanes, farm, turn the game around. also making this an item rather than an ability would make it possible to surprise the enemy team. maybe it would be fun to make this item's damage scale with objective health -- more objective health left, more damage done.