Why are you saying the wind deflected downwards?
I'm doing my PPL and have a fascination with how a wing produces lift...
I'll say it more simple as I love taking technical words and giving simple explanations...
The wind can do two things I think...:
1) Wind going over the top creating low pressure then getting sucked upwards like the paper example.
2) Wind pushing against the underneath of the wing (is that where you keep saying wind deflection)
I just stick my hand out the window when driving to see that I can feel wind pushing the underneather of my hand...
So I think it can be a mixture of both 1 and 2
