The injury isn’t immediately known.
HIPAA may not have allowed this to be disclosed. And - as with other evidence - Eric Holder may have been telling people not to disclose even records they could disclose, because doing so would anger the ferals. Showing that the “victim” beat somebody up was immediately called “character assassination”, after all, when the strong-arm robbery was finally disclosed against Holder’s urging...
I can see this since he tried to block the store video from being released.