Wait about 30 seconds to a minute before continuing with the trick.  This helps build the illusion that you actually have something to do with the cards being drawn to each other. This is the only real physical gesture you will make during this trick.  Try to have as little to do physically with the trick as possible.  This will strengthen the notion that you really performed the illusion.

Summary:
Position your hand over the top of the cards and pretend to concentrate hard.