of course!!
the pre emptive attack statergy of tai chi is quite advanced.
www.taichiworld.com
Look at some erle montegue stuff on sudden violence. His dim mak is a bit suspect, but his sudden violence stuff is some of the best around and is tai chi.
If you saw it you wouldnt think it was.
I have got some mpegs, will try to put them online.
Cheers
Chris