It's a really good example that doesn't prove your point. Wind is moving air.
If you are assisting someone the person is still able. They just need support.
Whereas help implies a more critical situation. A person needing someone to step in on some one's behalf.
No shouts "Assistance, assistance, can I get some assistance."
If this is still not clear listen to the Beatles song assistance.
Sorry for the toppo, add should be ass. Text prompting decided add was better than ass.