User blog comment:Lord Loss/Monster Hunter Theory... Blog/@comment-4361439-20130528183518/@comment-5043481-20130531113135

Maybe the tube is for eating food through. When you give him a steak, he eats it like he was chewing on it, but doesn't take his mask off. Now some of his masks don't have a straw, so he must just strain the meat through the eyeholes.