This anomaly massively amplifies air currents around it. A breeze that blows in becomes a 70mph wind as it enters the anomaly and does not slow down as it leaves. Winds do drop eventually but are not contained within the bounds of the anomaly. People exhaling heavily produce enough of a directed air current to blow somebody over when amplified.
An instance of this anomaly has been weaponised with a small fan attached to a battery pack and an assailant with a handful of darts.