You are kinder that I am! I typically will execute a fast front snap kick that stops within an inch of the groin area. I then talk about proper kamae as being a way to control both distance and the nature of the attack....
At another level, it is simply disrespectful for a student to do something other than what the teacher directs the students to do.
Nice to know someone appreciates my method of resolving this type of issue.Gee whiz, I have a fan at last!!Especially one who thinks alike. Cheers, Joe.