Visibly, and through Allomancy, Zane has apparently no metal on him. He got rid of his coin purse so that Kelsier wouldn't be able to track him.

But, when Kelsier starts to move, turning his back partially on Zane, a blue line appears out of nowhere: Zane spits one of the coins into his palm and shoots it at Kelsier, a mischievous attempt to knock him off-balance. He shoves him sideways to the anchors that he thinks Kelsier is likely using.