Suppose, due to armor reduction, someone managed to get negative armor. Trundle's ultimate says:
(Active): Trundle immediately steals health (by dealing magic damage) and a percentage of their armor and magic resistance from his target. Over the next 6 seconds the amount of health, armor, and magic resistance stolen is doubled.
Does Trundle just steal 0 armor? Does he receive negative armor as well? Or is it based off of base values?