Singed Can Flip Friendly Players

In ARAM today I was playing Singed and my teammate was Quinn. Tryndamere, an enemy player, was auto-attacking Quinn (they were basically standing on top of each other). I went to flip Tryndamere away from Quinn, but instead it bugged and flipped Quinn instead. Quinn and I were flabbergasted. I wish I record games but unfortunately I don't so I don't have a video of it. Sorry