Garen Villan passive on ultimate didn't choose any villians throughout ARAM game

I noticed about halfway through an ARAM game on Howling Abyss that Garen's Villan passive was not choosing any target. This meant no bonus true game throughout the game. I have no idea what steps one would need to follow to reproduce the bug since as far as I could tell, the passive never even started working once level 6 was reached.

Howling Abyss March 24, 2016 32:20 http://matchhistory.na.leagueoflegends.com/en/#match-details/NA1/2136119391/44011412?tab=overview