When you're escaping from runaway mutant zoo animals, you might have to throw yourself down a zip line to get to safety. In this deleted Zoombies scene, an alternate version of the zip line sequence reveals what the film set actually looked like.
With three zip lines set against a green screen, our actors basically had to imagine being hundreds of feet in the air. Clutching their respective handles, they screamed their heads off before "jumping" to safety.
The end result is seamless and shows just how impressive special effects editing can be.