Originally Posted by
Yahillwe
When leaving from France to a non-Schengen country, you always have to go through immigration, even when going on the Eurostar to the UK.
I think that was the point, and why the question mark was where it was. The rhetorical question was built on the assumption that lhrsfo also knows that there is Schengen exit passport control. Emigration control vs immigration control. But immigration control generally is taken to include migration, be it immigration or emigration.