What critical feature should a tag line possess during a high line operation?

In a high line operation, it is essential for a tag line to facilitate both lowering and raising. This versatility is crucial as it allows the operator to manage the load effectively in both directions, whether they are lowering a rescuer or a piece of equipment down to a subject, or raising them back up to the high line. The ability to support dynamic movement enhances safety and control throughout the operation, enabling quick responses to changing conditions or needs.

A tag line designed only for lowering would limit operational flexibility, as it would not support lifting efforts. Similarly, if a tag line is intended to be used in a static state, it would lack the necessary responsiveness required in dynamic rescue situations where adjustments in tension or position may be needed. Therefore, having a tag line that can do both is fundamental for efficient and safe high line operations.