He admitted he faked it after they won it all on a radio show in the summer of 08. Actually, I take that back, I guess that was a rumor in the summer. Injury was suspect to me. Didn't look serious enough to use a wheelchair but then again only Paul Pierce really knows.
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Either I wasn't paying attention in 2008 or I completely forgot. Looking at heyp's video, he gets hit by his own teammate and goes down. Why would he want to fake that? If it was a flop he took way too far, that'd be one thing, but he's not going to get a foul called on his teammate, even if he wanted one.