My old boss used to tell me to fire one of my experienced sales staff every now and then, who was slightly floundering to shake up the rest of the guys. He would say have a skeleton in your closet to show the others this is what happens if you stop performing, No one is safe etc
Often Dana's actions and ruthless treatment of staff remind me of him.
Maybe Shields departure from the roster was sending a message.
Thoughts? 
Sheilds was fired bc he's boring as fuck