
he/she was breathing. Lookie at their snout/mouth. Even if you put a rubber band around the snout, the lil jaw will open and close. As far as the gills go, you'll probably note that most species (dunno all of the physical traits of every SH myself) have a concave set to them, and then flare at the gill plate/end. This makes it comfy for them to breathe when they squeeze in and around rock, weeds etc.
Albeit uncomfortable, I'm sure that it was more annoying than a health hazzard. You should see when my fry all hitch in a ball onto each other.. it's like a superball with tiny hairs coming off of it
And that death roll thingy...great defense mechanism.. they'll do this if a
hermit crab gets to ornery with them and clings to their algae covered backs... or if a silly astrina starfish clings to them etc.
Dave