[WvW/Revenant] Fall damage bug possibly restoring health to full in combat.

Above is a video of me on the desert borderlands in WvW earlier this week. If you skip to 1:42 you see me jump off a high bridge while in combat and somehow restore my health to 100%. On my buff bar you can see the Windfall buff from air keep which should make me take no fall damage, but restoring health is something i've never heard of.

In the video description is also the build i use, notable trait is possibly Planar Protection in the retribution trait line which affects fall damage.