I agree. That's why they choose such locations for the rallies because they are easier to defend. When a location is riskier, they use the bulletproof screen across the stage. I am confident that wasn't actually Trump at the rally. What I'm not confident about is whether this was a completely staged event or whether they knew it was going to happen and let it unfold in a 'controlled' manner just to show how far the opposition was willing to go.