Theoretically, this process can go on indefinitely, effectively rendering the jellyfish biologically immortal,[3][6] although in practice individuals can still die. In nature, most Turritopsis dohrnii are likely to succumb to predation or disease in the medusa stage without reverting to the polyp form.[7] --WP

https://en.wikipedia.org/wiki/Turritopsis_dohrnii

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[–] 5 points 1 month ago

That signifies that the jellyfish is about to do a cleaving attack that you have to dodge. If it were yellow then you would be able to parry or block.

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