Its an Immelman with a special name. The motion is the same, its the exit that is just played with a bit.
Basically, youll untwist from the top but instead of that twist taking awhile, it happens quicker than normal. The real key is that the track flattens into a flat dive.
http://www.nolimitsdevcenter.net/i372
Theres another picture, but the ride would need a lot more tweaking. But that shot is pretty close and matches an angle Ive seen.