Just that really.
My DC was kicking my DH. My DH was kicking back (playfully I guess). I got in the middle telling them both to stop and my DH then told my DC to kick me. My DC then started kicking me.
DC is only little (under 5).
Would I be unreasonable to leave him?
There is (obviously) a big backstory, but it is too long for a post. There has been other occasions where he has encouraged our DC to hit me.