This is because it is quite possible that neither ship (unless one is a salvage tug) will have a suitable replacement for the towrope if it parts.
Le nto yenzeka kuba kungenzeka ukuba nokuba yeyiphi inqanawa (ngaphandle kokuba enye ngudokolwana wokusindisa kwilahleko) iyakuba nofakelelo olulungileyo lwentambo yokutsala ukuba iyaqhawuka.