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jambon
Basically, when you start undoing the nut that connects the radiator to the system, nothing will come out because the bleed valve is creating a vacuum.
As you undo the bleed value, the water will start pouring out the side that you've undone.
so it's a balance between how much the bleed valve is open and how much the retaining nut is open as to how wet your carpet gets :)
TLDR: have access to the wrench at all times in case you run out of places to put the water.