Duncan Coral with Red Tentacle Protruding out Mouth

[CalsReef2020]

Recently purchased a Duncan Coral for my 10 gallon tank and today I came home to find an odd scenario. The duncan has its mouth open with a red tentacle coming from its mouth. All of the corals around it are agitated. I have owned duncans for a while now but have never seen this. Doss anybody know what is going on

 

[CalsReef2020]

 

[Breadbox]

Could it be duncan poop?

 

[CalsReef2020]

Could it be duncan poop?

Could be, I am always watching my tanks and have never seen this happen?
Just curious as to what is going on.