Ashe Ult Game Breaking Bug

I'll try and give as much info as possible. The last match I played in ranked I was Tristan and Ashe was my opponent with a Nid support and my support was Sona. Basically I was running back to my tower as I saw a gang incoming I think and Ashe shot her Ult at me. It literally went right through me and didn't damage me or stun me. Like, it wasn't a close miss or anything. It went directly straight through me and I was able to turn around and kill her. I don't know how it happened or how to replicate it but I should've been dead. After I killed her, she all chatted saying I hacked or something. Which obviously wasn't the case and she may have been being sarcastic as well. If I were in her position I would have probably been saying the same thing.