That was the general idea. The monster itself seemed to be gearing itself for a charge, so he takes the duck's hand.

"We might have to get out of here faster than expected. Hold on tightly!" And he spreads his wings and tries his first fly spell. Not that he can't fly on his own but the spell certainly gives him a boost to get him off the ground quick.

Too quick in fact.

Entirely too quick.

One could say they are shooting fifty feet in the air and zipped away by the wind as Aziraphale fights to get control.

This...was probably not the best idea in retrospect.