Hardly possible to represent a person IN CUSTODY as being threatening. Of course, it is possible that his lawyer might try to use that as justification, but still.
There’s a difference between being in custody and being followed.
The protester was walking in front of the deputies and was not handcuffed or otherwise restrained.
For some reason you keep trying to make him a victim here so I suspect you might be a Cruz supporter and any excuse to make Trump look bad is fair game.
I’ll confess I did not know all the circumstances of the situation. If in custody then yes, the old guy was out of line and should pay the price.