Superman SeatGrab 
One Hander

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Step By Step Instructions:
 This trick starts out by learning
the standard superman seat grab.

grab hand: Hand which grabs  the hole in the airbox
while you are doing a superman seat grab

Non-Grab Hand: Hand which is not grabing the airbox
hole and is stationary on the bars while the standard 
superman seat grab is being executed.

 
While the superman seat grab is being
executed, the hand that is still on the
handlebars is removed. This is done after
the grab hand is secured and as the legs are
being pushed away from the bike. release of
the non- grab hand can start before the legs 
are all the way extended. The non-grab hand is
brought back to the handlebars before the grab
hand is released to re-grab the handlebar.

Working Up to it...

While working up to the superman seat grab one
hander, you want to be careful and ease into
the hand-releasing process. If the hand is removed
to abruptly and you are not comfortable, you
may lose your bearing (or the bike)! The first
time the hand is removed, it should be a VERY
small motion. In fact, the hand should not be
moved far from the handlebars at all. The fingers
should be spead out, releasing the pressure from
the handlebar grip. Once you are comfortable
with the motion of releasing your control over
the handlebars, you may begin to pull your
hand away from the handlebars more and more
each time. Be sure to bring back your hand with
enough time left in the air to safely bring your other
hand and legs back onto the bike before landing.