I saw a 5/6 year old repeatedly slapping my DD who's 2 years in the 0-3 area of soft play. I ran over immediately saying 'hey!' As she kept slapping her. I picked up dd who had been pummelled to the floor by other child and had red on one cheek and scratch marks, turned around, couldn't see parent and said 'you don't hit another child like' that in a shocked/raised (not shouting voice). I realise my panic transferred into the voice and I feel awful I didn't deal with it in calm and collected way, and just pick her up and find member of staff to deal with parent (who was in corner with headphones on, on phone facing away from soft play). This is first time I've seen DD be hit like this and I can see scratch marks on neck and arm but face has returned to normal colour. I know you're not meant to tell other people's kids of and I'm shaking/feeling awful.