Sounds like we agree on quit a bit except damage on the impact and your argument about a spot check due to air currents so here is a hypothetical question dealing with falling: According to RAW If said dragon starting at 240 ft up dove at 240ft move rate nose first into the ground how much...
moving flying creature vs wall of force
I had this come up as well in one of my games.
- Wall needs to be flat ie no turns
- DC 40 spot check to notice it
- doesn't need to be anchored
Where it got tricky was the damage.
The speed of the dragon was 240 ft per round. doing some math that...