Lol, why are the votes always even?! O_o
I'm changing my idea: Now, I think it was just a combination of the two, but if I had to pick the bigger contribution to his death: I'd pick the wildebeasts. And here are my reasons why:
- They would have broken Mufasa's fall, but they would have tossed him around, trampled him, stabbed him, and sliced him with their horns (ouch)
- You wouldn't see the full extent of the damage because that would be to gorey
Soo: Scar made Mufasa fall which made Mufasa land in the wildebeasts who finished the job.
So, basically, it's Scar (which is something I think everyone can agree on

)