No blooms on this Phal, but roots and new growth are a good sign. It's still recovering from a Noid Lowe's rescue. I hope the "Rascally Root" doesn't cause the leaf to drop.
This actually is very common for many Phals, Angraecoids such as Aerangis, as well as Sedirea. Doesn't necessarily say anything about future of the affected leaf and not much you can do about it, I'm afraid. It just happens.