Dragon Ball - I dont know what this yamcha is but it sounds just like raditz

…why is Yamcha standing and not curled up on the floor, dead?

Well, Yamcha did beat that one Saibaman. The Saibaman blew itself up because it was outclassed and it knew that was the only way it could take out Yamcha. So, while Yamcha didn’t kill it with his own hands, it did die because of Yamcha. Does that count?