The low loop although not being directly behind the arrow like a offset loop, helps to curb nock travel (or more precisely, helps to curb the effects of it) as it allows for a bit less pressure (more leeway so to so speak) as the arrow is released. i.e. as the arrow is released the arrow is forced down, then below level and then back up to level (or even back above on really poor designs). When using a regular loop it' s going to create more conflict as the arrow wants to go down and the release aid is pulling " up" . Having the contact point lower helps to offset the pressure. Besides the nock travel benefit and less string wear it (as well as all loops) almost entirely eliminates torque and reduces string oscillation. Hooking directly to the bowstring is not nearly as good in that regard.Your anchor must be perfect..too light or too much pressure on the anchor against your face is not nearly as critical, nor is any slight twisting of the release aid or release aid hand, and again, no direct pressure against the arrow nock."