Overpower

[TouchandFeel]

5y starting from the edge of target enemy's hitbox or 5y from it's center?

5y starting from the center of the target and needing to reach at least the edge of the other mob's hitbox to register that mob getting hit, not edge of hitbox to edge of hitbox.

lets give an example of a simple 3 mob pull.

Precisely. If two mobs are 6y apart, targeting one with Abyssal would obviously not hit the other but running into the middle of them and using Unleash would, not because it is bigger but because you have changed the emanation point and so the distance is no longer the 6y between the mobs but instead the ~3y between you and the targets, allowing Unleash to hit them both.

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Overall look at it like this, if you were standing exactly where your target is standing and you used Unleash, would it hit the other mob/mobs?
If yes, then Abyssal would also hit them.

While potentially confusing if you are not the best at spacial parsing and correlation, the fact that it works like this is also one of it's greatest strengths.
Take for example the most common usage of the ability, using it on a large group of mobs to do damage and keep agro.
Since the emanation point is based on the target and is independent of your location, you can target a mob that is roughly in the center of the pack and spam Abyssal while keeping the entire pack to one side of you and never having to step into the pack to make sure you hit them all which makes it easier, at least imo, to keep the pack grouped and organized as you want them.