If you watched the original avatar series or the legend of korra, you should know that the Sub-Bending of Airbending is Soundbending. With that being established, there hasn't been many airbenders to fully show this Sub-Element. Although, using the knowledge from what I have gained a higher understanding of, airbending masters are able to manipulate air so that it can create sounds. This is like when the wind blows outside in real life and it begins to produce a whistle from flowing through/around objects. This is taking that same idea but making it so airbenders can control that sound right into someones ears or around them.
If you hear a loud bang in real life or something startles you, you may jump and be confused or afraid for about 2 seconds or so, until you see what has actually caused this sound. Well, once again with this idea of airbenders manipulating sounds, what if you didn't see anyone or did not see anything creating that sound that startled you? You may be confused as well for a short period of time.
That is where this "Logic" comes from.
