This is a Kamen Rider entry. There will be more than one of these (Forget Shin Kamen Rider for a moment here). Notably, when the three Riders finally start working together, right after their iconic henshin poses. Also see Incendiary Exponent.
When Ichimonji as Rider-2 goes Big Damn Heroes in to save Hongo/Rider-1 from the Shocker ambush at Shiro/V3's place. Sure, a camera cut was needed to pull off the thrown-off-his-own-bike-into-a-flying-kick maneuver, but there's no denying that this is the very definition of Dynamic Entry.