He's directly under it. The device itself takes up ten square feet (a 4 by 4 square), and is on the ceiling. Midnight Owl is on the floor covered in chains that also takes up a 4 by 4 space. You toss the wine bottle into the gravity field, it flies like normal into the field but as it reaches, it almost immediately changes trajectory and crashes down right on the shoulder/neck area of Midnight Owl. You hear several bones shatter under the pressure caused by the one wine bottle. The glass of the wine bottle shatters as well, and due to the weight being so profusely higher, the glass digs itself into midnight owls skin, causing him to scream in tremendous pain.