"Shots resolved at such a target can only be resolved as Snap Shots unless the model or weapon has Skyfire special rule. Template, Blast, and Large Blast weapons cannot hit Swooping models."
Of note Snap Shots also preclude any template, blast, or large blast weapons, however, they also disallow any "shooting attack that does not need to roll or automatically hits"
So if the masque's ability counts as a shooting attack it wont work on Swooping models. If it's just an aura or some non-shooting special power it should be ok.