[spankalib]

Make friends with the hangman so he ties and places the noose properly; so at the end of the drop, the tooth-like dens of C2 (the 'odontoid' process) slams against the midbrain/pons/medulla - killing you instantly.

I suspect Judas did (k)not know how to tie & place the noose correctly, thus strangled & involuntarily kicked & struggled, thus breaking the rope...

He was remorseful though, so it is sad all around, to me, that he killed himself instead of asking for forgiveness.

Regret would be concerned about the consequences of your actions to yourself.

Remorse would be concerned about the consequences of your actions to others.

[Hebrews 11:6]

Thank you, John, for contributing that informed medical explanation! Your presumption certainly sounds likely.

it is sad all around, to me, that he killed himself instead of asking for forgiveness.

If--a big "if"--if Judas had already been born again before his betrayal, then his failure to seek forgiveness may not have been fatal to his hope of heaven.