Pistol Shrimp acting funny

So, last week I added fish to my 10 gal. I added a clown goby and a yellow watchmen and a tiger pistol. The clown goby is doing fine. And I could have sworn the tiger pistol and YWG paired up. After about half an hour, the YWG were building a burrow and I was happy that it worked out so well. Well, they were good for a week. Lately they have been inseparable. But today the Tiger Pistol is hanging out outside of the burrow. He has been out all day, and the YWG has just been sitting in the burrow. From everything I have read, if the pistol goes out so does the goby. Are these guys paired or were they just hanging out together? Is there something wrong here, or are they paired and I am just overreacting? :hmm1:
 
They sometimes quarrel about where to put the burrow, and one will move without the other for a while.
 
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