[quote=@Leotamer]
How is connected to the external power source, a wire, a transmitter. How would you cut the power source without getting close to the goons. 
[/quote]

Well, I hope that you realize that the cage isn't in plain, open sight (likely inside a room in the ruins), before considering the answers I'll give to those question. Finding it as soon as your character sets their foot on the village would be very metagame-y, just as much as disabling it at the exact same time, giving no one a chance to react.

With those observations made, here are the answers:

- They are connected through cables, to a magical power source. The whole set up isn't very unlike that of a portable generator linked to a machine.

- They can be cut, but certainly not without getting close to/passing by the soldiers that are guarding the cage. Of course, they are guarding th power source too.

- Mind that there's fighting happening there right now.

- The key to the machine's controls is with the lookout/spotter, just like [@TheWindel] answered earlier. That's the only way to disable it without blatant sabotage.

Anymore questions?