These ducks are not fair game

This little toad was throwing small stones at the ducks and they picked them up thinking they were bits of bread. Then he started chasing them, his mother was sitting on a bench behind me, laughing, obviously thought it was funny. I didn't know whether to have a quiet word with her, shout at the kid or discreetly shove him in the river. Fortunately the ducks flew off so that problem was solved but the mother will probably wonder why she has ended up with a teenage thug in a few years!