Corrected entry: Druitt (Jack the Ripper) states that he needs to have seen a place before he can teleport there, otherwise he might materialize inside a rock or wall. Yet he was able to teleport into the middle of some housing development, in the middle of Baton Rouge, to look for the invisible girl.
Bishop73
3rd Feb 2009
Correction: He can still teleport to places unseen, he's just saying doing so is dangerous (but not impossible). Throughout the series we see the characters do dangerous things out of necessity.
Bishop73