Ahh just because they can self resurrect like a wimp who can't fight and they taught blink to hunters there superior..makes perfect sense

I believe that Hunters actually "stole" the art of blink by observing the Warlocks in secret. Correct me if I am wrong.

They didn't there's either a grimoir card (idk how to spell it) or a price of gear or something that says warlocks taught it to the hunters

It never says that Hunters were taught by Warlocks, just that we "learned" from Warlocks. As it stands, there is no true evidence to prove either theory, but if you think that Warlocks would even think about helping Hunters out, may God have mercy on your soul. IMO Hunters did steal Blink.