Meh. I've spent time in jail after getting picked up at a protest. All charges eventually dropped. Knowing you're there for the right reasons, with strong outside support makes a huge difference. I'd gladly take some jail time on a fight like this.
Charges were pretty ridiculous actually. Everyone got disorderly conduct, and something about carrying weapons ('sharpened sticks', aka protest signs, which, in fact, I wasn't).
It was an excellent lesson in how arbitrary and asymmetric the criminal justice system is. The police are basically free to make shot up on the police reports, and it was only because we had so many people with identical reports with egregious mistakes that we were able to fight them on the charges.