Pistol Shrimp paired with a Blenny?

[WallysWorld]

I'm aware that pistol shrimps will pair with Watchman Gobies, but it looks like mine is pairing with my midas blenny. I see them both sharing the same hole in a rock fairly often.

Is this normal or somewhat unusual?

 

[Peace River]

Bump

 

[LesPoissons]

I have seen a similar pair at LFS but with a jawfish. The blennies and gobies are also similar fish and fulfill the same roles and can benefit in the same way from the shrimp.