The George Mason High School boys varsity soccer team claimed the Region B title, but their season ended following that high-water mark after a surprising 1-0 loss to upstart King William High School in the State Tournament quarterfinals hosted at Mason on Tuesday night. With hearts as heavy as the night’s torrential rains, the Bull Run District and Region B champion Mustangs watched as their state title aspirations disappeared despite dozens of opportunities to pull even and prevail.