It took a full 2 seconds for X to realize what was going on. First he was bewildered by the power going out, THEN Vile headbutted him. And while it didn’t do too much damage, it really hurt!
Once X recovered from the attack, he then realized exactly what happened.
Vile had escaped. He was unarmed, and hopefully still restrained, but he had still escaped from the sky bridge. And there were no alarms going off; the power was still out, and the back-up generators weren’t kicking in like they should.
X turned to the broken window and, after surveying the area down below for a bit, jumped down to track Vile down. He would be moving in complete darkness—new moon, no flood lights outside, and all patrol drones were most likely surveying the power grid rather than for escapees.
Vile had gotten phenomenally lucky.
With his shoulder right shoulder busted by the fall, Vile had to hide somewhere before X look for him. Since it was too dark, that wouldn’t be much of a problem. He ran to a nearby rock, wich was big, since he shocked against it before finding it, and crouched behind it, hoping that X wouldn’t search too much for him.
Even if it was all dark and no one could saw anything, Vile’s shoulder was sparking, making him easy to spot. So the only thing he could do at that time was to wait and try to hide his shoulder behind the rock he had luckily found.
X was able to jump down with little trouble, but found the low light levels to be annoying. He had to take a few moments to adjust his optics for the conditions; he should probably install a night-vision mode next time he went by the Armory.
Once his vision had adjusted itself, he raised his Buster and moved forward slowly. Vile had managed to hide himself fairly well for now.
As X searched the area, Vile was hidden behind that rock, knowing that it was only a matter of time before X found him. He grabbed a nearby rock— Only big enough to make a good distraction— and threw it in X’s direction, hoping that X would look away from him. Since Vile was disarmed, he had to use the stealth elements in his favor, like the darkness and simple distractions like rocks.