Reverse wagers are always double action IF bets.

Part A

Cowboys -5 $110 to win $100
IF ( win, tie or cancel )
Dolphins -14 $110 to win $100

Part B

Dolphins -14 $110 to win $100
IF ( win, tie, or cancel )
Cowboys -5 $110 to win $100

If both teams win +400
One win, one loss -120
Both teams lose -220
Push +200