Even if the meatheads in the room had no idea who the tall guy approaching the front of the room was to ask questions / argue a point, there were several opportunities for someone to step in and attempt to diffuse the situation before he was shoved out of the room, taken to the floor and cuffed. Instead, a bunch of cell phones come out with hopes of filming something violent. I seriously doubt that nobody on the FBI/ICE side in that room knew who Padilla was. If he was breaching any rules/protocols for a press conference in a secure Govt facility, they should have talked to him once they got him outside the room rather than manhandled him to the ground, as he wasn't fighting back.
Sickening event, from what was being spewed about liberating the city to how escalated, and the unnecessary force was used... not to mention chilling from a 1st Amendment perspective if indeed this was a situation where nobody in the room genuinely knew who Padilla was or what his intentions were.