A purple haze descended on LoDo Tuesday night. It had nothing to do with the smoky skies produced by the Canadian wildfires. It had everything to do with Boston Red Sox right-hander Cooper Criswell, who snuffed out Rockies bats for seven innings. Criswell, pitching for the first time at Coors Field, gave up five hits, walked one and struck out four, and the Red Sox won 6-0. The Rockies were shut out for the 11th time this season, tied for the second-most in the majors.