He was circling on the bike taunting them, saying stuff like "I'm not an American citizen," and the ICE dudes just tolerated it until the bike rider dropped his phone, and detected weakness and pounced, before the guy snatched up his phone and managed to ride away.
Tragicomedy is the best description.
I mean today ICE even tear gassed a bunch of Chicago cops who were trying to clear a path out for them. The ICE thugs are cowards and will turn on local police in a heartbeat. (See also capitol police beaten on Jan 6.)