Yasuo's Windwall
I was playing an URF game recently as Galio, and Yasuo's would windwall me just before my ult at times, with us on opposite sides (me:yasuo, wall between) and it seemed every time that happened, my ult did no damage to him. It wasn't his shield blocking the damage, because the damage was enough to break it and hurt him, and the same happened on a time when his shield was on CD.
Does the wind wall block Galio ult damage, or just a bug?