[whswhs]

That sounds like a possible interpretation, since I see that Autoteleport indeed also has Blind Only, -50%. On the other hand, it doesn't seem to be spelled out. In fact, Exoteleport says, "You must be able to see the subject or know exactly where it is," even though the build has Blind Only. Is that an inconsistency?

And on the other other hand, the Warp is applied as an Affliction. Don't Afflictions require you to be able to see the target? I didn't think you could say, "I want to afflict whatever is at 30 yards from me, 30° tp the right from directly in front of me, and at ground level." So that would seem to imply "you must be able to see the target" and full stop. What Blind gives you is not the ability to affect a target you can't see, but the ability to send it to a place you can't see.