Bill Cain’s familiar 1990 drama about a troubled Latino Catholic high school is the flip side of David Wilkerson’s inspirational priest-versus-gangs classic The Cross and the Switchblade. The priest in charge of Trinity Mission School has two words of advice for idealistic new teacher Tom Griffin: “Be callous.” Squashed into a suitably claustrophic space, Nicolas Minas’s staging for Blindfaith Theatre is passionate, blending professional actors and energetic performers from the Duncan YMCA’s Youth Theatre Workshop. Erez Shek as Lee, the budding artist with a violent home life, is a standout. But despite the hip-hop embellishments, Cain’s script remains an exercise in urban-jungle cliches, and he takes too long to say too little. Through 6/18: Wed-Sat 7:30 PM, Sun 3 PM, Duncan YMCA Chernin Center for the Arts, 1001 W. Roosevelt, 773-250-7130, $10.