does this friend also run with scissors by any chance?
the Acme company makes a great little product called "glasspy"
ur friend puts his hand under this microscope type thing, and a big siren goes off if there are any fragments of glass found..
cool huh? its like a metal detector , but for glass
you might have a hard time getting it away from elmer fudd, but good luck
just kidding, seriously , have your friend get his hand checked out if he's concerned about it..
in the future, the use of brass knuckles in fights might be an idea
good luck in nursing school and welcome to allnurses Jillian!