Aurelion Sol ult sends my Nunu channelling biggest snowball ever off the map in Nexus Blitz (video)

In a team fight, Nunu (me) starts channelling Biggest Snowball Ever and runs towards the enemy team. When Nunu approaches Aurelion Sol, Aurelion Sol uses Voice of Light in Nunu's direction. On the frame where Voice of Light's damage and knockback lands, Nunu seems to be standing on the every edge Voice of Light, and upon getting hit flies off the map (Nunu's icon disappears and reappears). Nunu reappears above where he was hit several seconds later.