go and tell a member of staff at one of those kids ball places that another child had hit your child?
To explain,i took ds{4} and dd{2} to one of those kids action places, balls, slides, trampolines etctoday. Only in the place 5 mins when a member of staff came up to me and said just to let you know that your ds has hit other boy in face, not sure what happened as it was parent of other boy who told us but keep an eye on him blah blah. Knowing my son, he probably did so i took him aside and asked what happened and he said other boy wouldn't let me down the slide. Not an excuse for hitting but in his head he was justified. My ds was told off and given warning. Just wondering though as a parent would you go and tell or would you leave it, one off incident btw. Just seemed very childish thing for parent to do.
Phew, all done!