Interesting,
At the time i saw the skill, with the npc, i haven't paid attention to see that is a passive skill, so i bought, and didn't know where it was. Then i open again and see thst is passive.
So i start using it a lot, because my ranger rogur is a trap master too. But i went to the deep caldron and not used it. It was bad, but, would be really nice if it was a active skill. Or maybe another way.