The two Bible stories depicting Judas' death contradict each other on various points. The various attempts to cobble all these bits together are actually quite entertaining reading. They all depend upon ignoring the plain reading of one passage in order to forcefully interpret it in terms of the other one.
It should be clear that Judas either died from hanging by his neck or else from a particularly nasty fall. To try to pretend that both of these things happened in a bizarre tragicomical sequence is to say that one's own proposed synthesis takes priorty over a straightforward reading of either text on its own terms.