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There's cleared space around the stage, then a basic perimeter fence around that. Then the risers of attendees behind that (and the chairs in the front). The press were roaming within the cleared space, but probably not desired to be lingering behind the stage (but I don't know, I don't know what their SOP was).

When you start hearing weird shit over radio chatter, then those in a security role start to get tense and probably start actually enforcing things more seriously. I don't think that's a big stretch.

It was supposedly less than a one minute time-window between confirming the anomaly upfront, and the incident happening. A whole cascade of events can happen within ~30 seconds of from hearing something like "There is a confirmed shooter on the roof!" of something, from a department of people that only met probably a few hours/day before (such as being a Secret Service agent hearing something on talkgroup shared with local PD, likely not completely believing it at first, but enough to start getting shifty/paranoid).