I had my bary get stung by one of these things and thought he was a goner. I whistle him to follow me while he was being stung than I swam to the surface. No death message appeared so I swam back down and I turned around and he was following me. I wish I was there to see what happened.
Use the ichthy they said... it's immune to shocks they said... that's fine I'll quickly swim done with no scuba gear and lure one to the surface...zap... surface is so near yet so far... manta finish the job