Your going to have to turn it in the opposite direction it was turning when it broke to get it released. Not knowing which way that was perhaps you can look with a loupe or magnifier of some type to determine by the alignment of the ball to the flats of the socket. Then using a sharp pin punch and small hammer attempt to return it into alignment to remove. Because of their construction when people use a cheater pipe and get medieval with them they actually set a burr below the top of the socket and become dog fast. Good luck and worse case you will damage the baffle when removing and must replace it. Hope this helps.
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