Note 367 — Chapter XXIX · TRAINING THE T̤ARLĀN OR PASSAGE GOSHAWK
D. C. (Douglas Craven) Phillott translation
The author probably means that the hawk should chase till the partridge puts in; that if she is fast and taught to take quarry quickly in the air, she will acquire the habit of only doing so, and will consequently give up whenever she sees that the quarry is fast enough to take her to a distance.