ashtray.
Very useful.

but still not to bad, since this car had oil in it. It takes a few hours stand still to fully drain. And there is always something left in the oil filter.
Yes the pressure is non existant, but, for this short duration. I dont think any bad happened at all. If you built up an engine, you turn it by hand, almost dry. So I would just calm.

show me the technican who would fill oil in a running engine after he drained it?

Its fine.
Not nice but fine.
It wasnt dust dry. Luck in bad luck