File a report/complaint now! If 'something' does happen, you'll have a report on file already. As for the disparity of force......if you fear for your life of the life of someone you care about, and danger/serious bodily harm is apparent, then do what you have to do.
It may just be as simple as bullying, but you should take no chances. Take every proper step now. If an actual crime was commited, then take care of business, now.
whatever you do, don't just stand by and hope nothing happens.
This is just my advice, nothing more.