How can Blaze shimmer over to me without he knowing where I am or where my lair are?

Very, very, simple. In the show, they state CLEARLY that you can shimmer/orb/blink/whatever not only to a place, but also to a certain person. So there.

Ok, thanks, bye, Link is gonna die!
^Poem.

Question answered, topic closed!

If you need more information, feel free to start another thread.