Sorry, yes, I was talking about the Elemental Attack. The engulf attack has a physical damage component from pressure, etc, that I wouldn't expect the mask to help against. However, the gas mask in the SR book completely closes off form the outside, feeding from a 1 hour oxygen supply when engaged, so I would think it would help prevent the secondary effects (anaphylactic shock). I'm cool with however you choose to rule it, since getting hit with a (Magicx2)P, (-Magic) AP from a Force 6 spirit, the secondary is pretty much overkill.