...does not cause Ensnared 2 on casting, but Ensnared 1. It fades on the opponent's turn, so the player can move their champ without penalty if they are on the edge of the mire.
Yes, I reported this like a year ago to SOE reagrding the Elder Murkwurm's version doing the same thing. Likely was reported before that too by others, would love to see it fixed.
It's actually ensnared 0, I think. Walking out of the aoe removes Ensnared, even on the turn it was applied.