My idol to the rescue
So, that smoke will be all over the place...
I want to explore the spin, a rescuer with a rescue bag encounters sometimes, without any warning. And it doesn't stop on it's own.
The purpose of finding streamlines is, to find out, if there is any effect of the downwash on the spining cargo, and if maybe that air flow is the reason for spinning in the first place.
Controling that smoke grenade will be very difficult. I was thinking about mounting a beam with two grenades (some distance apart) just under the hoist (mounting on ceiling).