Yah! Im verfy fond of Trapping and chin na myself. What I usually do when saprring somebody from another style (and I do this quite often just for fun, even if I get my butt kicked from time to timt), is the I would fake an attack, forcing him to "offer" me a limb when he blocks my feint. I try then to adhere and half tep to close the distance a little bit and end up in push hands range. After that its just tui shou, only instead of pushing him away I would try to lock him, just hard anough to make him tap out, nothing more.
If it was a real life "encounter" I could always tighten up the lock till he is sanding on his toed and then kick or sweep his legs eithoug letiing go of the lock!
hid own body weight would then increase my leverage, ending up breaking or tering a joint or tendon! not nice at all but it happens!
Not everybody is that easy though, ans with the popularity of groundfighting these days, everybody will have a little ground training (or think they do!) and try to take you down. Its gets a little hairy this way but its still fun!
Im talking about "friendly" sparring of course! but it helps a great deal to at least apply a very basic part of the art in "real" time!
after controlling the limbs any punch/palm strike, elbow strike or even kick will have room to be executied if needed.
woooaaaHhh! sorry for the long post!