Uzin's Instant Treadmill

You chose one 5 foot square surface you can touch, you draw an arrow pointing in a direction. If an object or creature makes contact with this arrow they fly in a straight line up to 50 feet in the direction you chose before falling to the ground, stopping early if it impacts against a solid surface, or hitting another arrow and being sent into a different direction. If the target would strike a creature, that creature must make a Dexterity saving throw. On a failed save, the target strikes the creature and stops moving. When the target strikes something, the target and what it strikes each take 1d8 bludgeoning damage. If an unwilling creature steps on the arrow they must make an acrobatics check against the user's spell save DC to evade the treadmill entirely.

The speed of the moving target is increased by 10 feet, and damage done by the treadmill's momentum is increased by an additional 1d8 when affected by another treadmill.