Bunkai Teleport.
Bunkai Teleport is one of Janemba's technique while in his transformed state. Stemming mostly, if not completely, from his power to control reality, Janemba in his final form has the ability to fade backward while he's breaking into cubes, very similar to Instant Transmission. This ability actually pulls him through more portals much like Illusion Smash, but requires him to separate into cubes first. This is supported when Vegeta fired a blast at the space Janemba just left, but the blast hit him where he reappeared as if it traveled with him.