Thanks, Gordon. I have heard the standard GKR theory on it, but it never made any sense to me. Seemed rather foolish to drop down for a knee level strike, leaving head and back unguarded, to do what would have been as easy and much safer to do with a foot, you know?
And the rest of the suggestion just doesn't fit - if you have swept them, or struck their knee (which would have very little effect unless they weren't facing you anyway), then they surely won't be standing around waiting for you to get back up, attacking you (from your right?!) and then not trying to move while you do a body level hooking punch...
As for your rear arm choke Mick... I'm still working on that one... should I worry if the children start turning blue?