The stoppage of the winds around this area was sudden. Not a gradual decrease over a longer period of time. Instead, it was within a shorter period of time just as the sun began to set. Not instant, but sudden enough to cause many to notice when they didn't even have an affinity for wind mana.
This wasn't the only thing though, Su and a few with higher earth mana affinties had started to sense movement within the heart mana. Before, it had been the same as what earth mana was normally. A resting and constant flow beneath the earth everyone walked on. However, now, it was as if it was reaching up toward the air.