I didn't use it on a crowd, it was on a single person and another time on 2 people.
Amazing how quickly some windblasted water in the face changes a swimming escapee into a sinking drownee. He was rather happy to see the boatful of plods row out to greet him. A 14-yo ratbag from a kids detention centre who stole cars for fun. Now he would be 51 and a resident of a prison, I expect. Recidivism at its best.