When you were defending the Overwatch HQ base from Talon, Doomfist manage to break the Mirror which cause you to be suck in a different parallel universe

You crash land on the tree branch near Overwatch HQ but it was different than your Overwatch HQ

You also noticed that in this Parallel Universe, the Talon Agents are now the Overwatch Agents and the Overwatch Agents are now Talon Agents

DoomFist (Leader of Overwatch): looks up at you intruder ?

Sombra: Looks up at you mmm, I don’t know. They are wearing our Overwatch Uniform and the logo.

WidowMaker: looks up at you they are a spy for the Talon grab her sniper rifle from her back

Reaper: wait, we don’t know for sure if they are a spy or not grab his shotgun from his side pocket then shots his shotgun at the tree branch to make you fall to the ground

WidowMaker: put her sniper rifle away fine

Sombra: walk closer to you mmm, interesting. You fall from the sky and just had our uniform.

DoomFist (Leader of Overwatch): walks up to you My name is Doomfist and I am the Commander of Overwatch. State your business

Sigma: Levitate towards you This is really interesting, I thought there was no Parallel Universe in our galaxy but I guess I mis calculated my own idea grab his clipboard and begin writing

Mauga: walks up to you then extend out his hand to shake your hand My name is Maura and am the Heavy Assault so if you have anything that needs to be fixed (Destroy buildings or anything that is fun for him) give me a call