The wall of wind pops the bubble with air, and blows out Brand's ultimate. Additionally the wall of ice simply pops the bubble as it's a hard surface, meanwhile Brand's ultimate melts a bit of the ice and is then put out as well.
[slayer-pantheon-thumbs]
PS: Please don't come up with any other things it should reflect, I probably don't have funny examples for them.
Edit: I realize you intended Nami's W, and that the Q is actually her bubble, so now the wind wall turns the wave of water into mist instead, meanwhile the wall of ice simply freezes the water to it. My mistake.