Strange Angel Acrivity

[Fossilman06]

Picked up a Lemon Peel Angel almost a week ago from LFS. I started to notice that the Angel has been going in and out of my Tiger Pistol Shrimp hole. It also does a little booty shake at one of the entrances when the shrimp comes out. I purchased the Tiger Shrimp and a Pink Bar Goby at the same time, but they haven't found each other yet to pair up. Seem like the Angel is taking over that duty now. Has anyone seen anything like this before?

 

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We go through a lot of angelfish. I would have written this off as the angel just wanting the cave for itself, but the second video convinced me this is something else.

I have never seen this behavior before, but I also haven't kept any pistol shrimp with any of our angelfish. The dance they do reminds me of the pairing dance many Centropyge do when they are first paired.