NYPD Caught Putting Live Man into A Body Bag

Watching this video you'll think to yourself "I've seen dogs treated with more humanity then this".  The crazy part about it was the man in question who they claim was a threat wasnt even resisting arrest, he wasn't making it difficult for the cops to put him in the contraption.  
So the question for me becomes what merrited this type of treatment.  I searched a little further to see if I could find a back story and I came across a post online and according to Daily News:

Cops restrained a crazed man in Manhattan by placing him head-to-toe in an enclosed body bag, an online video shows.
In the bizarre video, uploaded to YouTube Thursday, a group of officers can be seen zipping up the live man into a blue-and-white NYPD sack near 14th St. in Eighth Avenue.

It was not immediately clear what happened to cause cops to restrain the man, but an NYPD spokesman said cops use the burrito-type bag “when an EDP is violent and may cause harm to themselves or others.” The sack has vents and allows for breathing, the spokesman said.
Still doesn't explain what he had done.. Hmm Let me know if yawll hear anything else about it..