He rapped. A moment later, he heard a creaking sound like Brother Lorenzo slipping out of bed.
Trembling, he lifted the phial of bat's blood, drank it down. It tasted salty. He chewed on the wolfbane powder until it mixed with the saliva of his mouth, then he swallowed. Holding the ancient scroll-segment before him, he began to repeat the badly-written incantation: Ut fiat homo lupinus, pulvis arnicae facenda est et dum....
A thousand jolts assailed his body, as if he had been struck by all the lightnings in heaven. Then, came a rushing paralysis, a distortion of time and space, a dread feeling of disintegration and death ...
The door to Brother Lorenzo's cell began to recede, swelling in volume as it did. The ceiling of the corridor likewise retreated at ever-increasing pace. Staring down at his own dwindling frame, Ambrose saw that the slug-white flesh was now covered with thick fur, even as the limbs were gnarling—
Then, suddenly the door opened. Brother Lorenzo stepped out, his kindly pious face wrinkled with sleep but otherwise showing no irritation or displeasure at being summoned from his rest. At first, the monk seemed not to have noticed Ambrose's form, for he gazed above him and away.
Ambrose kept on shrinking.
Finally, Brother Lorenzo's gaze chanced to glance downward. But still, his features mirrored no recognition or alarm; only puzzlement.
Now, thought Ambrose, now is the time for me to snarl.
But no snarl, nor semblance of a snarl, emerged from his lips. Rather, his lips had elongated into long sucking proboscises, while already a third pair of limbs had commenced growing from his furred-over abdomen.
This was not a wolf-like form, he was assuming, Ambrose suddenly realized in terror. But if it was not lupine, what was it? Had he misread the incantation? Had he mispronounced a simple word?