that footy was filmed while shooting with MSP the year before and the fall can be seen in Yearbook.  it was the fall that broke his elbow.
i've heard that MSP did some backstabbing, but i don't know how so.  in my opinion, by moving to PBP, Seth is ensuring that his career will last that much longer and be that much more lucrative.
also, correction on his age- he's 32.  either way, though, he's getting older, but i don't think that means he has plans to go anyway any time soon.