if (you.hunger_state < HS_FULL)
                return;

Followers are rewarded for moving slowly and killing creatures which are faster than they are.  Moving too quickly or using magically hastened weapons is frowned upon.  He rewards his faithful with a slowed metabolism, the power to slow other creatures, harm those who move more quickly than you do and finally, the ability to step out of the flow of time.

Followers are rewarded for resting with their tummies satisfied, moving slowly and killing creatures which are faster than they are.  Moving too quickly or using magically hastened weapons is frowned upon.  He rewards his faithful with a slowed metabolism, the power to slow other creatures, harm those who move more quickly than you do and finally, the ability to step out of the flow of time.