Walt had killed all the Nazi guys, and in this version of the ending, the machine gun didn't shoot Walt. We're now at the part where Jesse holds the gun to Walt.

"You want this," says Walt.

Jesse however, says he won't pull the trigger unless Walt says he wants this. Taking one last deep breath, Walt says:

"I want this."

With that, Jesse shoots Walt. Once in the stomach, then in the chest. Walt falls backwards onto his back. He lay there motionless. Jesse stood there until he heard sirens. He got into a car and finally escapes.