The main question is RISK MANAGEMENT and the second Mission Preparation. Seems to me we do not know enough about this in that special rescue mission.
Some years ago i was alarmed in bad visibility to rescue a group of volunteer mountain troopers and a victim with a broken ankle. Because the volunteers lost their key to the equipment room they decided to go out without rescue equipment. They climbed up to the victim which was generally in good mood but unable to go of course. Lacking ropes, rescue bag or harnesses the volunteers tried to bring the victim down under senseless risk, but at last without success. A high risk helicopter rescue (Long Line) mission was started in bad visibility. I was mad furious!
In the descibed file it was better to wait for a backup key than to go blind with a rescue syndrome.