Well you could switch off the donor vehicle to halve the perceived problem. But actually, whether the engines are running or not, you still have live 12+ volts at both ends with no short circuit protection!
So as the previous poster says, keep leads apart and clear of everything.
The donor should start again as it was full up before the jump start.
Put some electrical load on the 'jumped' vehicle to stabilise the voltage, not too much, before disconnecting.
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