Something else that comes to mind for me, but with limited info hard to quantify...
If he was indeed hired to guard the bank or its properties, from the pics I can’t see where a building is close enough to be considered guarding it. If he left his post to go meddle with the protesters this is really not going to end well for him. Or will definitely make it worse in court.
All the news I've read said he was guarding reporters of a local news station.