Halo Contact Harvest 10

Avery raised his pistol and emptied his clip. He knew his rounds wouldn't punch through the alien's shields, but all he wanted was to draw the thing's attention and keep it from hitting any of the
recruits. As Avery's shots flashed harmlessly against its back, the alien turned. But by then Avery was already running south for the safety
of a boulder.-Chpt.15