spelling
As far as I remember (and it's been a while), cross-generator or generator assisted starts were not permitted on the Twotter. The #2 engine was left running to keep the gen on line running all the elecrics and keeping the battery fully charged.
What I have seen on the Do228 is the crew spinning the prop after shut down - I was told that this was to vent residual hot gases out the engine and if it was not done, a hot start would result.