My new? pistol shrimp!

I'm stoked. I bought one of my tanks from a friend about 6 months ago. He had it for about 4 years. For the last several weeks, I have been hearing a clicking sound in the tank. For a long time I thought it must be an equipment noise. Then I noticed some tunnels in the back corner around a rock. So last night I dropped in a piece of raw shrimp next to the rock and waited with my trusty red lensed flashlight. After about an hour and a cramp in my neck I was rewarded with a blur of brown and some clicks, and then a tug of war with some weird worm. My problem is that about 2months ago I bought a yellow watchman goby planning to get a pistol down the road to pair him with. Mr. Goby has taken up residence as far away from the pistol's dorm as possible and NEVER wanders more than a few inches away from his rock. Is there any thing I can do to encourage them to "hook up"?