Judge Dugan escorted the subject through a "jurors door" to private hallways and exits instead of having the defendant leave via the main doors into the public hallway, where she visually confirmed the agents were waiting for him.
I couldn't tell if the judge knew for certain that ICE was only permitted to detain the defendant in 'public spaces' or not.
Regardless, the judge took specific and highly unusual action to ensure the defendant didn't go out the normal exit into ICE hands -- and that's the basis for the arrest.
I don't necessarily agree with ICE actions, but I also can't refute that the judge took action to attempt to protect the individual. On one side you kind of want immigrants to show up to court when charged with crimes so they can defend themselves... but on the other side, this individual deported in 2013 and returned to the country without permission (as opposed to the permission expiring, or being revoked, so there was no potential 'visa/asylum/permission due process' questions)