I don't remember Entrap's para wearing off when hit on Euro or LR's for that matter. I thought "Paralysis" was a poison with a direct time of affect i.e 3 seconds of para for a successful entrap (or whatever it is.) to have it "un-para" when hit is strange, trap or e-shock it works like that because the mob is "sleeping" and when hit will wake up and fight (although standing next to the mob also wakes it from e-shock/trap). In my opinion having a skill like Entrap where it pulls the mob towards you and paras it for a few seconds is very useful, having that first hit "wake" the mob is kinda harsh and defeats the purpose of it inflicting para in the first place...
What's the point in pulling something towards you if the next thing you are going to do is run away from it? As it stands the para on Entrap has little to no use outside of group situations, where you can pull mobs from other players and jog a little away before it wakes.
In fact, I have vague memory's of leveling with a warrior on Euro and he was LRing then CHMing the Para'd mobs, rinse and repeat so he was talking almost no damage.
If a mob is para'd and hitting it un-paras it should this not be the same for players then? Maggots, Wedgemoths etc etc all their paras state an exact time you must remain para'd for regardless of how many other mobs are hitting you.