Huh. Leareth isn't sure if the Ring is that much less interested in them as people (he feels faintly offended on their behalf, if so), or if it senses the compulsions and isn't even trying.
Hmm. Step back and reassess.
He will do a Gate at two miles ago, and send a person in without any compulsions. If they make a run for it, it'll take a while, and he can send some compulsioned Elves to grab them if the scoop-Gate fails.