The Galena High boys basketball team couldn't sustain its level of play in the second half in a 63-56 loss at Bishop Gorman on Saturday in Las Vegas.Galena jumped out to a 17-8 lead after one quarter and led 38-29 at halftime. But the Grizzlies were outscored 34-18 in the second half. Galena still led 47-46 going into the fourth quarter before being outscored 18-10 in the final period."It was a pretty good game," Galena assistant coach Jeff Keyes said. "We played well in the first half. They came out and played strong in the third quarter and played pretty …