Through the clutter of the empty building, he saw someone crane into the doorway at the same moment he peered into the glassless window. Altaïr was impossible to miss. Suddenly they were right in each other's line of sight, both men framed in the light from outside.

He didn't immediately run, as that would encourage a chase. He didn't feel like taking that chance with a stranger until he could feel him out.

"I did not see anyone inside there, if that is what you are worried about. But I would not rule out a trap."