Deadly Attraction — Episode 8

You looked in the mirror, didn't you? Maybe just a peek, but I swear there was nothing there. That shadow is clearly dangerous. I'll need to keep my distance. Class is now in session. Today's lesson, English by way of riddles.

I will ask a riddle. If no one provides the answer, one random classmate will suffer first question what cannot be seen or touched but can fill an entire room and the more you try to escape it the heavier it becomes it's there right the The-the answer is air!