Pace lines and you have to have faith in others in front and behind you. But I take it you had been riding with them for quite a few miles so you could reasonably well have trusted them. I am prepared to believe that the rider in front slowed and that is not a good tactic in a pace line. As you have just found out.

Sadist coming out in me now. Abrasions like you have sting. They may be healing and they have to be kept open to the air unless an old style Gauze and Bandage can be wrapped round them. But they sting- even if you are sitting comfortably and doing nothing. An old remedy that was taught in the Marines and that is Surgical Spirit. It will clean the wound- sting like hell for a couple of minutes but then give you a couple of hours of painless time. It is alcholol based and the other way of getting the pain to ease is a bottle of Brandy- But taken internally.

Sorry about the Cuts and bruises and I think it will warrant a couple of days off work so some good has come out of it. Give you enough time to check over the bike and sort the repairs.