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It doesn't *really* look like a proper gas mask. Maybe they use that opening to attach a tube to the mask and pump something for that poor mud to breathe.
Or it's kind of a punishment. You make a mistake, you must wear the mask, that inhibits your oxygen intake. Remember: "Why is it so hard to breathe?"
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Ohh that's a good thought - I was thinking it might be a mud in the mines wearing a mask so he doesn't breath in dust and die quicker