To me it has the feel of being pre planned

[markodochartaigh]

27. Lots of people were filming.

I do think that it is possible that ICE, at whatever level, was looking to stir things up, to take things to the next level. I think that it is possible that the agents saw that he had a gun and decided to target him specifically for that reason since they could more easily paint him as an instigator at the very least. When he first was down one of the agents can be heard asking "Where's the gun". Clearly it was not just the agent who grabbed the gun and walked away who knew that he had a gun. Perhaps they saw that he had a gun when he bent over to help the lady. Perhaps they have some technology which allows them to tell when someone has a gun on them.

Either way, I personally would never, ever, under any circumstances endanger myself or other protesters by carrying a gun in a protest. You will never come out on top of the police who are trained in tactics and firearm use, who act together and have infinite reinforcements, and who are almost certainly going to be judged to be "in the right" legally. The most that you could hope for is a settlement which pays to help bury you and hopefully helps your widow and orphans.
If there is some undercover agent provocateur, they are most likely either police or police adjacent. Following them and trying to identify them is all that you can do.