Zac passive bug, or I got hacked.

Just finished playing zac top against riv. Lee came to gank and i ended up killing riven and i still had my passive up. lee and I were both super low and he q'd in on me and I died. I just died. No blobs. First death, no previus executions none of that. If I had been in a ranked I would have uninstalled no joke wtf riot.