I know bungie wants us to use the guard feature on a sword, but with the exception of the invincible strong hold titan build, there is no reason to use a sword gaurd function. It consumes your sword energy, so you can't use your heavy attack as much. It's not as effective as glave sheilds, and it reduces movement, making you a target. So I purpose that taking damage while guarding should reflect some of the damage back. They could tie the % reflected to the different guards a sword can roll. On the high end, something like heavy and burst guard could reflect back 50% of incoming damage, and on the low end, sword master could reflect 25%. Then ofcourse they could add range limits, like only reflects damage back to enemies within 20-30 meters. Doing this would make the type of guard much more valuable and would make it a better option in pve. Cause as it sits now, the only good guard is sword master, and that's just because it increases the charge rate for sword energy.