No one was a threat, but the cameras were evidence.
A viral video appears to show masked ICE agents slamming an already restrained young man's face into rocks, then pointing tasers at bystanders whose apparent offense was filming it.

ICE keeps showing up, dressed as if accountability is a lost concept. Masks on, names hidden, bodies moving fast, then the familiar panic when somebody nearby has a phone. The man on the ground is already secured. The people filming are not attacking anyone. They are doing the one thing authoritarian cosplay hates most: gathering receipts.
Previously:
• 'A little rough': ICE attacks US citizens in Oklahoma City
• ICE gives the world another reason to skip the U.S. World Cup
• Practical tips on filming immigration and law enforcement
• Trump back to blaming the victim, business as usual for ICE
• Videoing police violence is the new 'See something, say something'
• 'This is why we killed that lesbian b****' ICE agents in Minnesota beat a veteran US marine