A proposed change by the NCAA rules committee would prohibit offenses from snapping the ball until at least 10 seconds had run off the 40-second play clock, slowing down the up-tempo, no-huddle attacks that have been making defenses dizzy. ''This rules change is being made to enhance student-athlete safety by guaranteeing a small window for both teams to substitute,'' Air Force coach Troy Calhoun, chair of the football rules committee, said in a statement Wednesday. More...