You and Marcus are secretly working together and you're a hero but secretly a traitor for Marcus and now you're on the Villain side. Right now you're doing a mission as you speak on the intercom to your teammate which you later betray for Marcus

You: Clear, enter on east side

a voice comes through the intercom

???: Copy that!

You: You switch channel to Marcus Go West

Marcus: Through the Intercom Copy that

He goes West because that's where its safe as the other Hero, which isn't you, goes East which isn't safe