Looking back to my ER days, I was assaulted more than once in 18 yrs. WIsh I would have reported them. I would report it now if I had it to do all over again. No matter what, you have a right to a safe work environment. I would also fill out an employee incident form and been seen by my PCP or in the ER. You can't protect yourself enough. If it's not reported, you can't claim workers comp in the event an injury shows up later as a result of the assault.