It's nothing. Don't worry about it. Forget you ever saw it.
But really, it's a unique trick called Upward force cancellation. Basically what you do is shoot the floor as if you were to normally jump. This would be your initial rocket jump. To stay in the air when you first jump you need to enter special state of jump which is known as air force accel. It takes a long time to master, so it's not really worth learn and you should never worry about it again, because only wonderland has mastered it and hasn't told anyone how. I can also do it because I am wonderland.
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