While I completely hate any shade killing that goes on, there is nothing that bans it in the HT bible.
If these players wish to have that little fun for their money, that's their stupidity. I can't imagine hitting a sitting target over and over gets your blood pumping all that much.
I think it must be like dating a chick that looks hot as hell, but has "log syndrome" in the sack. (lays there like a log)
At least, now we can see who HT is stealing money from, LOL.