A reason did occur to me though and it let's Jack off the hook for taking Cole's satisfaction away. Jack could see from his own long experience that it would save Cole a lot of grief in the long run if Dana just ceased to exist. Not a justification but the best I could do for an excuse.
Then again maybe it was just the bullet wound, cracked ribs and sundry deep bruises irritating him and Dana's smart mouth was the last straw. I know I wanted to shoot her. LOL
I think he blamed her, among others, for the death of Renee. That’s kinda why I figure its going to be a bloodbath.
If and when he figures out Logan’s was involved in Renee’s death (added to Palmer, Michelle and Tony’s first death) ... he’s gonna lose it big time. He barely restrained himself from killing Logan on Day 5. Bang.
SnakeDoc