calicant
Contributor
Could get tricky if a tentacle reaches a mask or regulator. 

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wheres the octopus at shelly beach?
I don't see curiosity, I see anger. Octos are very expressive with their color. When they flush red, they are not happy. You had him backed into a ledge where he had no escape. He lashed out. Sometimes the best defense is a strong offense. Setting your hand so close to him was not an invitation as mush as a threat, IMO.