Severed linkia arm

[Delphinus]

I have a burgundy linkia in my tank. Today I found one of its arms (sans the rest the starfish) happily wandering around the tank.

Bizarre. I haven't seen the starfish in about a week or so, so I don't know how long it's been like this.

I'm a bit concerned that if the arm doesn't make it, I'll have to remove it. I wonder if I should fish it out and put it in a refugium to see if it will regrow a new body.