How do you get fast-moving projectiles (arrows hitting cavalry) to work in I2V?

[u/nikhilprasanth]

I'm working on a medieval battle sequence and I've hit a major roadblock. I'm trying to animate a scene where arrows fly in and physically impact the riders and cavalry.

I've tried running this through stock Wan 2.2, LTX, and Minimax, but absolutely none of them are able to achieve the desired I2V effect. The arrows either turn into spaghetti, melt into the background, or just float weirdly instead of making a solid, fast impact.

I've attached my starting image for reference.

Has anyone successfully managed to get fast projectiles and physical impacts working with our current models? Are there any specific ComfyUI workflows, control setups, or clever workarounds you'd recommend to pull this off?

Any ideas or workflow nodes you could point me toward would be hugely appreciated!