Not sure what you mean by always on for skills. Do you always see, here, smell..of course. But do you se everything, hear everything? No. The roll helps decide the things you did not notice casually.<br/><br/>Of course if you KNOW an ambush is coming, that's one thing. But if you don't know a good perception roll might have you spot claws coming out from under the cover. Or the sniper on the ridge.  That help any?<br/><br/>Also, where did you roll? I dont see any in the E Dice Roller.