I don't know... I would normally do these 3 steps in these sorta situations in any places; at schools, at work, or even at dojo. 1. Go talk to the person first, address the problems witht hem first (and hopefully you did). Then 2, go talk to your sensei about it... I don't mean to make you feel like a whiner, but that's a proper and respectful AND most peaceful way to solve these kinda situations. If this continue, you can either ignore them (I do because I don't wanna deal with idiots after went through the first 2 steps already), OR you can take things in your own hands which I don't normally do. What I mean is it's hard to ignore them in a dojo. The best way I can think of is when they hit like a baseball player, hit them where they open really hard or knock their shinai off and tell them, if you keep doing it wrong, I'll keep hitting you (just like my sensei and senpai did). If they keep doing it, I mean, these guys are hopeless. And why not keep hitting their open spots just for fun? hehe