Care to expound?
I just don't like the idea that stunning and immobilization have the same mechanics of immunity.
For stun аnd incapatitate, this is understandable, but getting immobilized and not being able to do anything about it is strange.
Escape Artist feat will be much more useful for any builds if it does't have a cooldown. And if give this feat for some nimble enemies, it will be much more difficult to abuse them block the tight spots, but they will lose a half AP to escape.
Alternatively, I would generally make Escape a basic skill that initially available for enyone for 25 AP with some chance to fail(more Dodge - less chance to fail). Escape Artist in this case simply allows you to guaranteed escape without AP cost (and less invest to dodge skill). It may will also reduce cooldown for throwing nets to 2 turn.