Wow, that sure is ugly.
I am curious about something though: videos very similar to this regularly surface in the media showing cops using what appears to be obviously excessive force against restrained individuals. Whenever this happens, there is often a large chorus defending the cops, using the reasoning that "you weren't there, you don't know what actually happened" and "that short video doesn't tell the whole story". The general idea being that, as bad as it looks, there must have been some justification for it.
Why don't extend the same presumption of (at least "relative") innocence to EMS folks?