That tiny octopus is one of the deadliest animals on the planet. It has an extremely potent neurotoxin that has no cure/anti-toxin. You often don’t even know you’ve been bitten by one until you can’t breathe. By then it’s almost guaranteed to be too late. The only way to survive is to be put on a ventilator until the toxin wears off but the chances of getting to one in time is extremely minor.