The hardest thing in AI video right now isn't the image quality. It's the physics.

The specific brief was: “Subject stands in a rainforest. He pushes a large leaf aside to reveal the view.”

This destroys most models. Hands blend into leaves, textures warp, and the "push" lacks weight.

To solve this, I used Nano Banana to generate the perfect composition first.  Then, moving to Google Veo 3.1, the prompt engineering had to be precise. I didn't just ask for movement; I described the resistance of the plant and the biomechanics of the arm.

The result? A biological interaction that feels grounded, not floaty.