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Euphyllia that have been recently fragged, especially those done in a hurry for a swap or a show, can suffer from infections. Generally, those clear up with a week or two of recovery, but when the corals are repeatedly stressed over the next few days, a bacterial infection can turn into a massive outbreak.
Infected Euphyllia tend to present a couple different symptoms. Some dissolve away, leaving behind withered polyps and a white cottage-cheese like tissue. Others abandon the colony in response to an infection travelling up their stalk... the bubble that crowned out of your abandoned stalk, if I had to guess, was the last bit of that euphyllia's digestive tract, expanded with infectious tissue. In the future, try to siphon that out so it can't spread that infection further.
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