That's the thing about passive perception it doesn't really work as a blanket thing necessarily. I'l guess i'll explain how passive scores actually work..<br/><br/>Let's say you're in a dungeon, come across a treasure chest and search the chest for traps. You roll a dice and look for traps, simple enough.<br/><br/>Now how passive works is let's say you were in that dungeon and you told the DM, "I am going to search for traps constantly as we travel through the dungeon." Instead of rolling for each door, corner, and chest you come across you just use the passive score. It's essentially a time saver mechanic, but you do have to specify you are looking for traps/whatever it is you're keeping an eye out for, and as you stated Avreene was mostly looking off to the sides into the brush for goblins, I took that to mean she wasn't spending as much care looking directly ahead of her. If you want to challenge that judgement call, i'm all ears. I mean that sincerely, i'm not trying to be an ass.<br/><br/>it works the same if say... you were at a party or ball and you didn't trust any of the nobles or guests and you were constantly trying to gauge who was lying and who was sincere. Instead of rolling for each guest, you use a passive insight score. You are choosing to forgo rolling in exchange for just 'taking 10' as it were, to use 3rd edition lingo. Sometimes you win, sometimes you lose. But it is a choice the player makes to either roll or just trust to chance.<br/><br/>This is just a snare trap. It does no damage but it grabs you by the ankle and suspends you upside down.