Insane Valkyrie Scan Exploit

Hello,

I was playing ranked as a solo and got into a game with a Valk and Octane. A few minutes into the game, Valk used her ult and somehow was able to scan everyone on the map, but was able to move and shoot freely. The Valk and Octane were then going around the map mowing everybody down. I had absolutely no idea how they activated the exploit and what they did, and I had no say or coordination in the exploit, and I was really confused for pretty much the entire game. Please fix.