re: Engulf; I also wondered if it could be Echoed, and I noticed something about it that I… don’t really like, and I feel like others won’t either. If you look at the tooltip, it’s listed as an “Active Ability”, which… is also what Colossus Warrior’s Demolish (the channeled ability where you can’t move) is listed as.
Perhaps that’s not actually what “Active Ability” always means and my concerns are unfounded, but I did notice this and I have yet to see anyone else mention it.