Answer:
He could not feel the tips of his fingers in his right hand
Step-by-step explanation:
The human's "nervous system" is divided into two: the "central nervous system" and the "peripheral nervous system." Both of these work together to provide sensation to the human body.
If William cannot feel the tips of his fingers, then this poses a problem to his nervous system. It means, his neurons have a hard time communicating with the brain in order to signal the necessary information that he should be feeling now. This is probably brought about by a damage to the nerves because he had a major cut down his right arm.