I was surprised to note recently that I apparently got an assist as Anivia for doing nothing other than blocking an enemy champion with Ice Wall, but can't be 100% certain that I did not AA at all. There seems to be conflicting information on whether the wall does or doesn't grant assists when I look online, and most sources are outdated.
So, what is the actual behavior of the wall and can it grant assists when that is the only contribution towards a champion kill?