I suggest that you resume your usual pattern of caring for this plant. Do not "soak" the plant for a day, especially at this time of year!

If you lose/lost a lead, there will be more in the future. Count on it!

--Stitz--

If you have good roots, the leaf will rehydrate. If you have lost the roots, no it won't. Even if you have lost all roots, the next new growth will have roots.

Did the sheath have buds in it? If no buds and just the dry black sheath, you could still get blooms. My Chia Lin just opened it's first blooms today and the other sheath isn't even close to being ready to open.

Some sheaths do turn black and still bloom, some turn a dry tan color and then bloom and some bloom while the sheath is still green.

Brooke