Six red tanks. Six blue tanks. Blue owns a turnstile that flips time. Three blue tanks wait in staging, drive into it, and fight this same battle backward. Look at the first second: they are already on the field.
How time works here
Forward tanks live from 0:00 upward. Inverted tanks (teal, marked ⟲) live from the turnstile downward. To you they drive tail-first.
A shell flies in its shooter's time. An inverted shell jumps out of its target and back into the gun. Its crater sits on the ground before the shot.
A hit destroys the victim in the victim's time. A red tank hit by an inverted shell stays dead. An inverted tank hit by a red shell is a wreck until the hit, then it un-explodes and drives off.
B4, B5, B6 appear twice until they enter the turnstile: once in staging, once inverted in the fight. Same tank, two ends of one path.
The battle is one fixed script. It has to be: every shot must agree in both directions. Play it forward for red's story. Play it in reverse for the inverted crews' story.
Pick a battlefield
Space pause R reverse F forward ←→ step 1 s 123 battlefield