BANGOR, Maine — George Stevens Academy is most dangerous when it is able to get out and running. The Eagles’ relentless defensive pressure enabled them to do that often on Friday night. Top-seeded GSA of Blue Hill used a combination of trapping presses and gritty man-to-man halfcourt sets to force numerous turnovers that led to fast-break opportunities and carried the Eagles to a 76-53 Class C North boys basketball semifinal victory over No.