Once the employees knew the threat was real and they had seen the first few deaths (before the guns were removed from the armory), I'm wondering if the majority of people would've barricaded themselves in individual offices and simply hoped that the trackers inside their heads didn't go off. I think most people would choose "flight" over "fight" because they'd have that small hope that they'd be the last one standing.
shareYes, I would imagine a number of people would run off alone or bunch up and just hide and hope it will be over without harm coming to them. The experimenters might have then told them to join the others or be killed by the head bomb, at least that's what I'd write into it.
shareI think that would've made for a more psychologically-tense movie. Also think a few people would've been in so much shock they would've remained catatonic until their head bombs detonated.
Eventually, the remaining survivors might've gathered in a room and had it out battle royale style.