With an Agility of 2 and a Ranged Light of 1, you would be rolling (now that the cover is removed):<br/>1 Ability (d8)<br/>1 Proficiency (d12)<br/>2 Difficulty (2d8)<br/>1 Setback (1d6)<br/>A skill rank upgrades one of your dice from green to yellow, it doesn't add another die unless your skill ranks exceed your ability score.