"We aren't that far away, mind you, and when I stopped being able to hear your voices, I used a technique a martial artist taught me to empty my mind," He lies smoothly, when in fact he used his 'link' to Ichigo.  It's something both twins have allowing them to find her anywhere.  As long as she remains in the same 'universe'.<br/><br/>If the notes that Rei left about how the worlds work, it would explain why he couldn't track her when she vanished in Shinjuku last night.