What does the term 'to throw-up' refer to in falconry?

The term 'to throw-up' in falconry specifically refers to the action of a bird rising steeply on outstretched wings. This movement is crucial in hunting situations, as it indicates the bird's readiness to ascend rapidly to gain altitude and improve its vantage point while hunting or scanning the area for prey. Such an action demonstrates the bird's agility and ability to maneuver effectively in the air.

The other options refer to different aspects of falconry and bird behavior. The act of casting off a hawk from the fist relates to the moment a falconer releases the bird to pursue its quarry. Seizing quarry in the air describes the bird's action of catching prey while flying. Prolonging a meal typically refers to the bird's behavior regarding how it consumes its food, rather than any specific flight action. Thus, 'to throw-up' is uniquely tied to the bird's ascent and soaring capability, marking it as a vital term in understanding eagle or hawk flight dynamics.