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An Immelmann turn is an aerobatic and spaceflight maneuver, in which a craft flying on a level climbs through a 180 degree loop, then executes a half-roll, the result being a reversal of direction at a higher altitude.
Samir al-Halak executed an Immelmann turn while trying to evade Orion Syndicate ships after leaving Ryn III. (TLE novel: Well of Souls)