Teen Spirit was at the Highline Arcade Fire concert at Radio City (organized by David Bowie for the High Line Festival). "The security people  were assholes," Teen Spirit told OTBKB. "One guard elbowed the crowd of people that tried to get closer to the stage." Turns out Gowanus Lounge was at the show. Here’s an excerpt from his account. There’s much more over at GL.

What they could do, it turned out, was rush you, jump you, beat you and drag you from Radio City in a headlock.
We apologize upfront for not having photos or video. (The photo below
is of security staff several minutes after the fisticuffs. We know the
woman on the right was not involved. The woman barely visible in the
background is a supervisor who arrived on the scene. We don’t know the
role for certain of the gentleman on the left.) There were people who
shot video and photos of the altercation. Perhaps someone will YouTube
it. The action kicked off between Rows AA and GG in the aisle between the 300 and 400 section of the orchestra
when someone took Mr. Butler at his word and pushed past ushers. This
is not a wise thing to do at Radio City. At that point, about a
half-dozen employees descended on him, trying to stop him. They pushed
him into the seats and we saw at least one (and possibly more) of the
Radio City security employees punching the concert goer.
The concert goer may have struggled with them–either to get to the
stage or to escape the beating–but that’s beside the point.