When I first tried to make the effect, I thought it would just be a basic jump-cut - cutting from the actor on one side of the door, jumping against it, to the actor on the other side of the door. When I tried that approach however, the results were somewhat less than convincing...
So I used the last few frames of the "Jump" side to "blend" the actor into the door - a bit more with each frame, until they were completely on the other side and this produced a much more convincing effect. But don't take my word for it, check it out in the video below.
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