dmccarthy wrote:
...can't issue a challenge that is anything more than a game of tag more or less as that's illegal....
I realize this is a bit off topic, but is it really so illegal? People regularly come into my teacher's school to issue challenges. It's a kickboxing and grappling school, and so equipped to do more than play a game of tag without resorting to lethal techniques.
Occasionally, the challenges are in good nature. Some time ago, a judoka nidan visiting from Tokyo issued a challenge (he was very polite, but not too good on the ground), and a couple months ago some amateur boxing champs from your neck of the woods gave our kickboxing coach a good workout. (It would have been nice if the boxers had revealed their backgrounds before stepping into the ring, but fortunately the coach was able to handle them.

)
Unfortunately, most challenges come from MMA punks (nothing against MMA, just punks) who have a win or two under their belts and have aspirations of becoming "dojo destroyers." They usually leave with some bruises or a sore joint or two, but it's nothing lethal, and it keeps our coaches on their toes.
All this is rather a roundabout way to say that although challenges are a part of martial tradition, they needn't be lethal or illegal to still prove effectiveness. Do others find the same? I don't mean to suggest that challenges are at all acceptable, as they go against the fundamental tenet of respect common to martial arts. But when someone comes into the school and can't be deterred by friendly and respectful dialogue, then there's at least a way to resolve the issue otherwise.