In the current version, the transaction that does not get finished, are just cancelled. This will change in the final verison.
My questions about transactions still have not been answered. Nitesend in its current form is NOT anonymous. Its more of a muddling service than an anon service. It just groups transactions together but the inputs and outputs remain the same. Smaller transaction groups (2,3,etc) could easily be traced with reasonable certainty. How does Nitesend address this?