Tarqā — rises or lifts; root r-q-y.
Taṭʿanu — presses or thrusts; root ṭ-ʿ-n.
Tantaḥī — turns or aims toward; root n-ḥ-w, form VIII.
The three imperfect verbs animate continuous motion. Each adds a different physical phase: rising, thrusting at the reins, then making for a chosen direction.