"You as well, Daylight!" he yells back, as he starts trying to cover ground. It's very useful to have someone like him around, Aziraphale thinks, who is not only tall and strong physically, but also apparently a mental bulwark.

He's glad someone can remain cheerful in this situation, but naturally he is named Daylight.

He is also, of course, very easy to spot, and Aziraphale thinks he should like to be friends with him once all of this mess rights itself.