Derasa clam must have tried to eat my urchin

[Aframereef]

I have what looks like spines on both sides of the clam.

 

[vetteguy53081]

You guessed it on urchin. Evidence is there.
Question is. . . ..
Do I remove spines and hope for no tissue damage
OR
Leave it and hope clams works it out of tissue ?

 

[DonTavo27]

Maybe urchin just decided to crawl over it?

 

[Aframereef]

I pulled the spines out with tweezers. Healthy clam. He should make it. I have seen them fall off the glass before and land on him. Usually he closes and blows them off. Not this time.