Okay. I lied. Not exactly friendly fire. Just, "every ability can affect everyone". Kinda like Bard's ult affecting anyone regardless of team.
Imagine throwing your lantern to your ADC and the enemy Garen grabs your lantern and not only did he get closer to you, you gave him a shield.
Heal your enemies for some reason. Hook your stupid ADC away from a bad situation. Demolish your own turret. Galio ult to your enemies.
(I think it shouldn't be played in rift though, maybe an arena type map.)
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