When gunfire raged and blood soaked Mendiola bridge on the afternoon of Jan. 22, 1987, killing at least 13 peasant protesters, Marianito “Itoy” Dimapilis thought he would never get out of that scene alive. By DENNIS ESPADA Bulatlat.com It was nearly dusk. And despite having two bullets lodged on his left foot, Marianito “Itoy” Dimapilis…