I've had phals' top leaves break off a few times just from handling. It happens when the growth is soft because of too much shade, so you might consider increasing the light and air a bit to toughen the leaves.
In the meantime, your plant doesn't have to die, rot out or keiki. Put cinnamon powder on the place where the leaf broke. This will stop any rot from beginning. Put the plant in a favorable position for growth-- good light, good air circulating, and you will get another new leaf begin *from the crown*, in exactly the place it would have appeared if the leaf hadn't broken. In other words, the growth center in the crown is still intact. The cinnamon will prevent rot from appearing and killing the growth center. The new leaf will grow right thru the cinnamon.
Try it-- it's amazing.
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