"I'd noticed-" He begins, slashing out again at the shadows, doing little good but keeping them from getting too close, "-they weren't dying."

Which is a problem, because he's sure that dying is something he might do if he's not careful. The other man looks like he's aware of the same failing on his part too. Neither of them wants to fall foul of the shadows.

"I think that's a very good idea!" The assassin shouts, and once more uses the walls of the corridor to help him avoid the shadows and head back, planting his feet hard against the stonework and pushing off, landing with a roll near the other man closer to the mouth of the corridor. He's back on his feet in the blink of an eye.

"There's more coming up through the cracks. Head to the roof."