What type of figure 8 is preferred for rescue to prevent girth hitch lock up?

The figure 8 with ears is preferred for rescue operations to prevent girth hitch lock-up primarily because its design includes additional protrusions or "ears" that provide more surface area for loading. This feature helps in distributing the load more effectively and reduces the risk of the rope kinking or locking up during use.

In rescue scenarios, it is crucial to maintain a reliable and functional system that can handle unexpected forces. The ears on the figure 8 help in managing these dynamics by preventing the rope from becoming twisted or stuck in configurations that could hinder operation. The added stability from the ears allows for easier manipulation of the rope and enhances safety, particularly in high-stress situations where quick and efficient rescue maneuvers are necessary.

The other types of figure 8s do not offer the same level of advantage in preventing girth hitch lock-up, making the figure 8 with ears the optimal choice for safety and effectiveness in technical rescue operations.