Quote Originally Posted by Hezzlocks View Post
Weird that they attached that to a skill that's primarily for knockback resist, or at least the way they worded the tooltip suggests it's intended for knockback resist.
It's because they took away Tempered Will for PLD and made Holmgang simply bind a target now. Both skills used to keep you grounded so most knockback wouldn't happen but to make it fair to all four tanks they decided to remove TW, adjust Holm, and give all tanks Arm's Length so they all can do it the same way.