Bristtle worm shooting smoke!?

Shnabbles

New member
I had to remove a fish and that meant i had to move live rock out of tank and into buckets of tank water... then i noticed on several occasions bristtle worms coming out of the live rock and shooting a white smokey liquid into the water.... What was this?
 
Iv seen pics of snails breeding like that... But why would a worm do that while i was moving rock all over the place... i thought it was some kind of defence mechanism.
 
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