I’ve been playing Herald in WvW this weekend and I couldn’t for the life of me figure out why my Facet of Chaos would not knock enemies back. Having tested a few times in sPvP I can confirm that running Momentary Pacification from the Salvation line will cancel the knockback from Facet of Chaos. The daze is still applied, but only one CC is used, and it prioritizes the daze. If you intend to use your Herald elite for the knockback, don’t run this trait.
Edit: Update to this. The trait also overwrites the stun on Jade Winds, and converts it to a daze.
Aratyl ~Gate of Madness
Co-Leader of the Get Fresh Crew