To yell at someone elses child if they hit mine with a toy

[peanutbuttersarnies]

Feeling a bit guilty about yelling. I can't seem to stop myself and I am normally so quiet!
I should probably learn to bite my Tongue and usher my child away?
They are both 3.

Yelling = not good
Dealing with the issue = good

Although I have been known to whisper menacingly to a child of about 7 who kept battering my DD aged 4 at soft play 'I'm watching you' in an attempt to stop the violence. It worked.

Chasing...that made me laugh!