Dam that sucks dude, im just finishing my PW on is last week of flower, you are right at the point where those hookers start to turn a little purple and really swell up and put on most of their weight ( at least thats how mine were )
are there any leaves left on it that are any good? If it were me id flush the hell out of it, and just run straight PH'd water, cut off all the totally toasted leaves and run it till the end, maybe add in some molasses in the final week week and a half (if possible with your hydro setup, i know it jams some of them up), unless you start to see the bud looking worse then chop it, you might be able to get a little more out of it, what do you really got to lose? just figure out why that whore got fried like that, and chalk it up to a learning experience. Good luck dude, and update if possible, id like to see what you ended up doing with it.