Re: To Cut or Try to save?
Damaged roots don't function anyway (or take a long time to heal) so I think its best to start with a healthy fresh cutting and let it produce its own roots. Same case with most other plants which can be propagated from cuttings. If your main plant is only surviving with a small damaged root system, it might suffer from dehydration as there are not enough roots to draw up sufficient water for the whole vine.
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