They were told from someone (I'm assuming their supervsiors) that fans weren't going to be allowed back in once the game restarted and that when (if) the game continued it would be players/coaches only.
Miscommunication along the lines somewhere.
One thing was funny though, there was a huge fat security guard at the band exit, he started yelling and throwing a fit telling people to leave...
A fan who looked to be mid-thirties came up to him and said something to the effect of, "How do you know this, they haven't made an announcement over the PA?" Fat security guard said< "The game is done, you need to leave."
Fan asked what he was going to do if he didn't leave, fat guard said I'll get the police. Fan said go ahead, fat guy turned around and walked off in disgust because he knew there was no such announcement. lol