I think i spelled that wrong but anyways...

I saw a thread on here about auras a few weeks ago so i practiced it (for the fun of it because i really didn't believe it) but today i went to track first period my coach looked carefree and happy he was sitting infront of a white wall and i see this ting of scarlet around him sure enough 5 minutes later hes making us do the hill (a very hard punishment which involves doing lunges up and down backwards on a steep hill) because yesterday 3 kids were sent to the office for getting into a fight. But can someone clarify a bit more for me on what aruas really are?