Parthian

With which Parthian shot he walked away, leaving the two rivals open-mouthed behind him.

Source: tatoeba (6307717)

1828, Frederic Shoberl, Persia, Part 4, Chapter XII: Amusements and Exercises, The king’s cavalry are also trained to an exercise called the keykaj, which consists in turning about on the saddle at full speed and firing a carbine backward. This they learn from their childhood, and it gives them great confidence and dexterity on horseback. It is probably a remnant of the old Parthian custom so frequently alluded to in ancient authors; with this difference, that fire-arms are now used instead of bows and arrows.

Source: wiktionary

1911, Babylonia and Assyria: Modern Discovery, article in Encyclopædia Britannica Eleventh Edition, Midway in the mound is a platform of large bricks stamped with the names of Sargon of Akkad and his son Naram-Sin (3800 B.C.); as the débris above them is 34 ft. thick, the topmost stratum being not later than the Parthian era (H. V. Hilprecht, The Babylonian Expedition, i. 2, p. 23), it is calculated that the débris underneath the pavement, 30 ft. thick, must represent a period of about 3000 years, more especially as older constructions had to be levelled before the pavement was laid.

Source: wiktionary

a Parthian shot

Source: wiktionary