5th Gen Cannot see the differences of backsprite battle animation slowing down while being poisoned in Black 2/White 2

[thegoodguy3221]

Bulbapedia states that when a Pokemon has less than half HP or has a status condition, the animation slows down. But when I compare the backsprite speed differences of Pokemon with more than half HP but without any status problems VS poisoned Pokemon on various YouTube videos of Roxie's gym battle, I didn't see any differences. Are the backsprites animations for any Pokemon slowing down when it becomes poisoned in Black 2/White 2? If yes, then what's the percent speed decrease for the animation speed of poisoned Pokemon?