as others have said, it is definitely NOT toasted. It clearly has flesh on it. Polyps even. This means it can still feed and photosynthesize so it's definitely not dead (yet). It is likely just stressed either due to improper (or just different from what it's used to) chemistry or lighting. The browned out portion may NEVER colour up, but once it gets established its new growth should have its original colour in it.
Here's a blue stag that I got last year. It was a beauitful blue when I brought it home. Then it completely browned out within a week. You can clearly see how nasty brown it was. Kinda like yours. But it wasn't dead. It was brown and didn't grow much for nearly 9 months. But it wasn't dead. Then finally it started to throw up new growth. As you can see here, it's new growth is a nice blue that was its original colour. It continues to grow new blue branches while its base remains brown.
Anyway, this is very common with all SPS in general.