While Peter and the TARDIS are bumping into each other, Gabriel continues to search out Peter. If this were a physical maze rather than one in the dreaming, he would be able to find him immediately. As it is, it's difficult- and made more difficult by the odd dimensions here. He feels out for where Peter's mind is strongest and teleports in that direction. When he lands, it's not next to Peter.

He shouts out his name a few more times, hoping that he's landed somewhere close by.