My kind of hero challenge not counting lightsaber kills

I to would appreciate the answer. Maybe it's like diffuser. You have to hold down the mouse button with your left leg. That was so poorly explained that it took weeks and weeks to figure it out. Only 1 way to do it. Perhaps they meant you have to kill 10 light saber wielders with a grenade or something. Many times, their idea is good but the description is terrible and misleading.