Bubble coral being stung?

I’ve heard that there is a possibility that bubble corals can sting other bubble corals (not bubble tip) though many corals if you put the same type of coral next to each other are perfectly fine. I am just wondering if this photo seems as if one was stung... though the photo was taken after the lights were off and the coral was put in when lights were off but it was still open but closed not long after the other tenticals touched it

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