Silence!
i personaly think Kriabi has avoid it. Yeah, the lake is on the right side but emp didnt state that the wave would cross the battlefield, at least, me, that isnt fighting, assume that the wave was directed at Kirabi, in a diagonal direction, so it would only hit Kirabi, but Kirabi used that lightning jutsu to ran to the spot where Emp was so teachnicaly he is on the spot where Emp used his jutsu.
Emp, as i said didnt state if the wave crossed the field from right(where the river was) to the left so i think he aimed it to raikage, in a diagonal direction (otherwise emp would get himself hit by the jutus) but since Kirabi is now on the palce where Emp used the jutsu, i think he avoided.
Thats just what it seems for me, since emperor didnt state anything, just spammed the jutsu xD