Nerves are kinda like the power lines for the body.
They connect to the brain and extend throughout your body and when the brain sends messages for you to move your arm the nerves help you do that. they also are how you feel. Like if you get pinched then your nerves send a message to your brain and then you realized that it hurt
If you are a Star Wars fan, then the answer would be - he could use the force. :) I'm joking, the skill that will help him grab it before it reaches the floor is probably either agility or reaction time.
