Ned followed swiftly.

He saw the figure mounting the wall, as if to take position there as a sentinel, and then the truth came to him in a flash.

It was Urrea playing the congenial role of spy.
Ned rushed forward, shouting.

Urrea turned, snatched a pistol and fired.
The bullet whistled past Ned's head.

The next moment Urrea dropped over the wall and fled away in the darkness.