You were in a mission with your TaskForce, which included entering an area with toxic gas spread throughout. So you all wore gas masks for your protection, as you went through the mission.

Though, a few enemies were found during the mission, without masks. And they were trying to take the ones you were wearing.

As they had no weapons, it wasn't too hard to fend them off. Though, they did fight back. Causing one problem.

Your mask had cracked