This is because, if the cable were allowed to run out by the brake, the snatch on the cable might weaken the hold of the anchor.
Le nto ibangelwa kukuba, ukuba intsontelo yentsimbi ibivunyelwe ukuba iphele ngeziqhoboshi, ukurhiwula okukwintsontelo yentsimbi kusenokutyhafisa ubanjo olukwi-ankile.