It's hard to know what to say in a situation like that. I suppose you could say something like what you said here - "Good thing hurting children is going to be illegal soon," or something like that.Seems to me that even before our corporal punishment laws in Ontario (or was it Canada? I can't remember) changed, doing something like twisting a kid's ear (so that it hurt, not just a tweak) would have been illegal anyhow. I'm not sure, though. I suppose if beating a kid with a belt wasn't illegal, twisting their ear wouldn't have been.
They tried to make childbeating illegal here, but then caved in to Focus on the Family types who were upset that their Christian right to beat their children might be infringed upon. So they decided that they would allow certain types of beating, between certain ages, instead. I forget what the rules are. They're not really relevant for me since I don't beat my child at all, whether with an open hand to the bottom or a belt or fists or anything else.