You've been in the Inner Circle for a while, and you always wore a mask. Makarov didn't really care as long as you did your job right, but one of the soldiers seemed to be bothered by it, and decided to pull off you mask. Just in that moment makarov walks up behind him, it seems that he saw what happened.

He grabbed the man from behind by his neck and pushed him down on his knees with force.

"The mask.. give it back."

He says angrily.