Having shunned the event as president before, Trump decides to go to this one.
Security is lax despite previous alleged assassination attempts. There’s no checkpoints surrounding the hotel, the secret service agent in the lobby (or wherever he was) is distracted for a moment. Cole Allen’s moment of opportunity has arrived!
Although there’s an agent standing in front of Trump, Vance is evacuated before Trump is.
While everyone else is scared, Trump is not, but I think that’s more about his cognition than him knowing something was going to happen.
Karoline Leavitt’s comments prior to the event is probably just coincidence.
Trump conveniently justifies his fortified ballroom due to this incident before saying the event will be rescheduled. Hopefully with better security.