This was the hardest skull ever. I tried to grenade jump like 200 times with constant fail. Using the rockets got it on try number 3. Normal difficulty no skulls turned on.
[url]http://youtu.be/1LhvhEQwJJ4[/url]
hope this helps someone.
[Edited on 12.18.2011 11:12 AM PST]
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Yeah, it's quite easy using more than just a single grenade. Personally, I stuck a 'hog on the walkway and grenade jumped off of it.