In addition, I have actually been called out for horse-play when actually I was having to protect myself from an out of control kohei.
I am going to reccommend that if anyone is ever put in a compromising position when their joints are at stake, GET OUT OF IT! I do not care what sensei think or anyone else for that matter. If your personal health is at risk, your duty lies with protecting yourself, not with a sensei who cannot understand your unwillingness to submit to bodily harm. That is stupid!