My trumpets do that all the time. They look like they are shriveled and dying, but they never do. I do find they tend to that when they are splitting, which mine has done a lot in the 4 months I have had it.
I have also moved mine all over the tank, it has probably fallen into the sand a dozen times, I dropped a large rock out the other day while I was rescaping. Never lost a head.
It's not the best looking trumpet, maybe the ugly ones are hardier?
In any case I would leave it be. If the other head starts to go south, try moving it to another spot with either more or less flow.
I move my corals around all the time until they find happy place.
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