The admission that he had betrayed a lot more teams than he expected is strange -- and it makes John even more hesitant to let him go. Even though he was a prisoner, this being deserved to rot in some prison without a single way out, constantly on watch, and on death row. Had he chose to remain fighting, end him...

... And turns to Ami with the order to release him. After a second, he obeys, almost pushing him, showing his back to tell him he is not afraid of him. If he is waiting to trap them, he will destroy everything in their path. That is the fate of his enemies.

As Ami and John walk together, the focus on Cortana continues to linger on his mind. The thought that she is in danger - and that freeing their prisoner could increase it.

"Why did you let him go?"