It was to Crowley's credit that his face and demeanor did not indicate the inward huge sigh of relief he felt at Aziraphale's recovery.

Good. The further away the angel was from Belial, the better. Now if only he could think of an excuse to flee. Or a way to get Belial to leave, although no, come to think of it that wouldn't work because if the demonic king left after Aziraphale did, Crowley would worry he was going AFTER Aziraphale. Sod all.