WCKD attacked the Right Arm. They had taken Minho. And it was all because of Teresa. Teresa had betrayed them all, revealed where they were to WCKD.

Newt had been dealing with it poorly. It was to be expected. With his memories from before the maze erased, he had known Minho for as long as he could remember.

When Newt heard footsteps, he turned to see who it was. Those who had been in the maze had chosen to follow Thomas. To eventually strike back at WCKD and get vengence for all the lives lost, all the fallen friends.