Glad I can help!
Surface tension is a pretty cool phenomena, but this video will help you visualize what I was trying to convey:
The liquid starts “tearing appart”. In the gif involving Greninja, they seem to be emulating it by “cutting” the water texture towards the foam in 2 to 3 frames.
I recommend you use this Google Chrome extension that allows you to scrub through gifs, and even explode them frame by frame:
I’m eager to see what you create!