Guild Wars 2

Hi guys I’ve got one question. I play necro and always if I fight a thief , he will (perma)stealth with pistol and keep giving backstabs. Still that’s not the problem I will DS3 him (fear) and I imidiatly deal as much dps as posible. The thief goes into stealth and if his stealth ends he has full health again. I understand he would probaly uses his heal in Stealth,but everytime if he goes out of stealth he is fully healed.
What is the secret behind this?

I know they have a stealth heal but I believe that has a big CD (like others). I know thiefs have that evade with a small CD, but that won t heal you to full right?

I hope you people can awnser me.

Shadow Arts trait XI gives us health regen in stealth, that’s why he keeps healing while he’s in stealth. The healing itself is not that much (lower than Warrior healing signet) but in combination with other skills can be used to gain a lot of health back.