It should be noted that if you are not currently on a Raid or Strike with the individual wearing the mask that your damage will have no effect. This will also affect your crucible games, and every kill you make against your team counts as a negative point toward you, and a positive point toward the enemy team. As a final note, I'm willing to do more armor like this, as I have a full set for this mask. I've planned a full raid against the Vex on Mercury, and I would love to see some interest in it.