What he discovered could not have been further from his expectations. He was prepared to find Aziraphale bloody and badly beaten. He was prepared to find the angel missing a limb or near discorperation. He'd even been prepared to find other angels - or possibly demons - in the flat, still fighting with Aziraphale, although he'd dearly hoped that was not the case, and was ready to fight them on his angel's behalf.

He had not been prepared to find Aziraphale naked, for several reasons.