"The guy at the top had to set himself in place and the person who was belaying at the bottom had the rope coming down the mountain at him.
"It could have turned out to be quite serious if they were lower down the mountain. It would have been harder to get to.
"They were quite close to the top of the climb.''
One of the climbers is thought to have initially used social media to say they were stranded, which Prudden described as a "little bit frustrating''.
'We would far prefer if people need assistance for them to call NZ Police. [That would] help a lot with getting things done.''
Both climbers were rescued around 8pm and taken to the Remarkables Ski Area base.
Neither was injured.
A helicopter was not used for the rescue operation because of poor visibility.