On the 5 Piece of the Eternal Hunt it states: 'When you use Roll Dodge you leave behind a rune that detonates when enemies come close, dealing X Poison Damage and immobilizing them for 1.5 seconds.'
However when you Roll Dodge and the trap appears it is not active immediately, it has an arming time of around 1.5 seconds, similar to the Sorcerers Mines. However the Tool Tip does not mention this. So when you Roll Dodge and you see someone standing in the Rune you expect it to go off but it doesn't and by the time it's armed they have left the rune.
It would be nice for the Tool Tip to be updated to inform players of the Arming time.
House Baratheon: 'Ours Is The Fury'