Yep, we're blatantly just showing off now!
Start as you would for a one-handed flaka, and, as the board is sliding backwards, go into your diablo.
There are two ways of doing this; first way is to put your front hand back on the boom in the normal position, wait for the rotation to begin and then move it to the back of the boom and do your diablo. The other, flasher way is to leave your front hand off completely until the board starts it's rotation and then grab the end of the boom directly. This second method looks way better and is just as easy, but requires more speed than the first.