That's normal for pretty much all phrags (that haven't been pollinated). They fall off looking perfectly fresh like that.
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Most phrags are sequential bloomers. This means that new flowers emerge as old flowers fall off, so that there's usually only 1 - 3 flowers open at a time. The exceptions to this are:
1) The long petalled species tend to have all their flowers open at once.
2) Some species/hybrids produce branched spikes, where each branch can have 1 - 3 flowers open at once.
Flowers are short lived compared to a lot of other slipper orchids, and while it varies from plant to plant, and based on environmental conditions, a typical lifespan of an individual flower is often in the 7 - 20 day range (1 - 3 weeks). When flowers fall off, as you noticed, they still look fresh. If you want, you can float the flower pouch up in a dish of water, and it will continue to look good for at least a few more days to a week.
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