You guys are tough. However, arguing ethics and legality (which I never said were necessarily related, by the way) is entirely appropriate given the initial story and the following question on teaching others aikido.
And, in my defense, I argued earlier that the master's actions weren't the point at all. To quote from my post:
The motives of the teacher are enigmatic (and a little passive-aggressive), but the lesson to the student is very clear. One should be humble, not bully, and use one's skills for good instead of evil. After all, there's always somebody better than you.
I'm sure this isn't the only thread that has wandered a bit, and at least we're still talking about the ethical use of force -- you know, the point of that little story.