Maddux can give you advice about anything

'Professor' Returns as Spring Training instructor

“I would come in sometimes and Greg could tell I was ticked off, and he would say, 'Let it out,'” Bell said. “He would say, 'Don't do anything stupid. Take a bat to a trash can or something.' But it was, 'If you're mad, let it out. Don't hold it in.'”

I wonder if Maddux had anything to do with Khalil's self inflicted injury.  He probably just kept on him "Punch that storage cabinet!  Show some emotion!  It's not going to hit you back.  Go ahead!  Do it! Dooooooo it!"