A Manhattan principal told Luis Penzo, 19, to turn down his music. Penzo pounced on principal, leaving the educator with two black eyes and a laceration that needed seven stitches. This hot-headed teen only got a slap on the wrist: Judge Edwina Richardson-Mendelson granted Penzo youthful offender status and sentenced him to a conditional discharge — as long as he stays out of trouble for three years he’ll dodge prison and a criminal record.