Bowfront seam failure?

[Delphinus]

I don't think it's the same thing. He's referring to the filament structures within the digestive cavity (you can sometimes see them in the tentacles, or if an anemone is back lit). Basically, "anemone guts." I don't think you would see this get released except in an injury type situation where it would spill out of a tear in the flesh.

Slime is another thing though. But then, many many things slime up when disturbed, it's a fairly common defensive mechanism.

Who knows though. The thing is, we didn't stop to analyze what that stuff was under a microscope, so we'll never truly definitively know. We'll have to accept this as anecdotal/circumstantial evidence at most.