Mark apparently got this move from me (and I got it from Professor Orlick in the Hand Balancing Mastery Course), but the way in which he does it was new to me.
Once you get into a handstand move your hands in closer to a touching position, and then from there you move them even closer so a hand is on top of the other hand.
This in many ways mimics a one hand handstand as you’re lessening your base of support. A great lead-up stunt.
The difference is I had always kicked up into position with the hands closer or on top of each other, rather than moving them in. I have to say I like this one a bit more after having just played around with it, although both ways are valid.
Good Luck and Good Hand Balancing,