You sound like that’s happened to yaA blow bag can also break apart a weak solvent joint, or blow out a thin wall in a corroded cast iron, copper, or galvanized drain.
You think you knocked the clog loose, but actually the pipe is ruptured, and now is leaking behind the scenes.
Most all our pipe is under concrete slabs or hung up over a dirt crawlspace.. If it’s two story then it usually has its own vertical stack. Rarely see any problems in the Vertical.
I see problems with upstairs tub drains with long galvy arms stopped up. I hate it too.
I’ve ripped a lot of that stuff out over the years. Old lead pipe, Durham system, galvy water pipe, you name it. This is an old city.
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