I think the idea is that it snares the enemies so you can have a kill zone around your tank better. I've never used it, though, as everyone says that it's HAMSTER, heh.
The snare effect is not that great either, I tested it on Dread Ring zombies on test shard and did not notice much change in their moving speed. However, since devs said they have a bigger plan for HR in the future, lets hope for the best.
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cuz we all gave up on it and realized that 100% ap dailys dont work that well with an hr.