Bachelor Party

My fiance's bachelor party is two days prior to our wedding because he didn't want his best man to fly across the country twice. In addition to the groomsmen and groomswoman, one of my bridesmaids will be attending. She is married to one of the groomsmen and it didn't make sense for him to travel the two hours to the bachelor party, drive back home the day after which is when the rehearsal is, pick her up and drive back. It also didn't make sense for them to drive two cars for our wedding because our venue would make them pay for each car since they were staying overnight. My fiance was on the phone with his friends talking about the bachelor party and they might play paintball at the bachelor party. I've heard that it can bruise. I am concerned because I don't want the bridesmaid and groomswoman having visual bruising from playing paintball at the bachelor party. My fiance thinks I'm overreacting because I asked that they don't play a game two days prior to our wedding that could leave bruises. The girls will be in long strapless dresses so it wouldn't matter so much if they were hit in the legs, but if they were hit in the arms the bruises could be very noticeable. Am I wrong for not wanting them to do something that could leave bruising? If they do decide to play even though I have expressed concerns and they end up with bruises, is there a way to cover those up?