This was the worst of all possible situations. He was staring at Perceptor, and he was staring at Perceptor's relatively-exposed fuel lines.

How could it be that he'd made it this far only to be so sorely tempted at the end?

There...there had to be another way. The vents, perhaps.

He disappears back around the corner, slipping into the shadows and feeling along the edges of the floor until he finds what he's looking for. If he and Dead End hadn't mapped out so many shafts around the Haven, this wouldn't have been possible, but...

Now it is. He approaches Perceptor from above--

--and kicks out the grate not far away to drop down on the scientist.