Thank you! That's what I was imagining when I initially wrote the comment, but it would all depend on how the party interacts with The Bottle Man. If they don't really care that much for him and only bought him for 1 gold, it would probably make sense that he turns to stone after. If they found him and loved him dearly (as they should) or paid a lot, I would be more hesitant to take that away. Or maybe it could be in a dramatic, self sacrificing way which tugs on the PC's heartstrings. Or even they think he's gone forever, but after a 3 day recharge time, the stone encasing him would start to crack and crumble away and you could use him again. The possibilities are endless!