Civil courage -following ICE from a safe and lawful distance

As the DHS person who “happened to be driving by’ confirmed, he didn’t have to get out of the car and he did nothing wrong (other than ‘stop traffic ‘ which was an attempt at entrapment considering he was being unlawfully detained by ICE ) Either way an amazing display of lawful resistance

Question: Did they even technically have the right to stop him? Did he have to respond to them in any way legally? How universal is this (he seems white So that’s a factor)? Was the point about him “stopping traffic” an attempt at entrapment?