He was aware that garrosh would have WOW TBC Gold to be killed but only as an extreme last resort. It is possible to have cut off his head, cleaved his head with an axe, brutally punched him with the dooms hammer, or even cut off his head with a knife. However, it might feel too primitive. The final choice was the electric chair option to be executed by just one quick strike of a lightning bolt. It was quite painless to die, I believe. The lightning strikes at a moment and he loses all his senses, and is dead from the shock.
I'm trying convey that the warrior within thrall would not be able to be killed. It would have been the most brutal and painful death for garrosh. The warrior is honored. The wild one is shaman. The elements are more wild and uncontrolled. They cheap WOW TBC Classic Gold are easily pushed and pulled into destruction you quickly.