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The turbos themselves don't work off one another, it's a parallel, independent setup. If one goes, that bank of cylinders will go without boost and have a big restiction from the stopped turbine wheel. But the other turbo will still be able to spool up. The boost won't be balanced on both banks since the balance tube can't handle that much of a difference. Beyond the turbos, though, both cylinder banks will have trouble revving since they share the crankshaft and if one bank can't get its exhaust past the stationary turbine fast enough, it puts a strain on those cylinders and slows the other bank of cylinders through the crank. And since both will have trouble revving, it won't allow the good turbo to receive much exhaust flow. So depending on the amount of restriction on the seized bank, you'd either not be able to rev well enough to build any boost on the good turbo, or it will just build boost very slowly (either way it can't be good trying to beat a damaged engine)
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