The animation was driven by pose morphs tags that transformed the goal from the small state into the large state. Every secondary elements was then constrained to the goal post element and the net was also influenced by pose morph to change position and scale to match the goal growth.

The net was a full size goal model sourced online and I modified it to fit the small size goal.

The football interaction was simply a formula effector to fake a ripple on impact.

I also scattered grass on the floor to occlude areas of the geometry that were touching the ground to give a sense of the live action grass interacting with the 3D elements.

The live action football was switched to a 3D ball mid kick to art direct its ending position and interaction with the other 3D elements more seamlessly.