He knows the second she leaves her house, her scent in the air becoming instantly more palatable. He waits, knowing where she will be going, usually, generally only following if she deviates from her normal route.
It's not often.
Tonight, however, he's a bit more on edge, a bit more restless than usual. His brother is likely to blame for that. When she returns to the park, the current cigarette is extinguished and Hati steps down onto the ground.