I found something rare this morning... a quality write-up on USAToday:
http://www.usatoday.com/story/sports/ncaab/mvc/2014/02/04/college-basketball-wichita-state-coach-gregg-marshall/5202599/ ↗
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This explains a lot.
"After a year, Marshall was off to the College of Charleston to work eight years as an assistant under John Kresse, who recalls Marshall absorbing some losses so hard that afterward he would enter the restroom and vomit."
That's a common trait of competitors... people who can't stand to lose! They'll puke over any kind of loss... even a silly bet over a game of Nerfball.