I haven't seen that manuever done exactly that way (I am understanding that the rudder pitches the nose down and around in knife edge). In a way it sounds like a "split-S" but it (split-S) isn't done in knife edge, the pilot rolls inverted and pulls through to level.I have seen Patty do a manuever I like where she pulls up in a quarter loop. At the 90 degree point she rolls 90 degrees to knife edge and then uses the rudder to more or less do a wing-over to a 45 degree downline, where she rolls level.
Not sure why but I like to watch that one.
Dave Hamblin
(formerly DaveH on old site!)