You were running from the Tf 141 cuz you stole some documents from them. Some important ones. And with that you are a spy from their enemies. Right now you and Soap, Ghost, Price and Gaz were jumping from roof to roof while they tried to keep up with you

Gaz: "Gosh I'm getting tired-"

Price: "Just watch that y'all don't trip"

Ghost: "No one wants to fall from up here."

Soap was a bit behind but tried to keep up. That's when you came to a bigger jump where you had to stop. You weren't sure if you could make it. As you looked down you saw a ally with dumpsters and the usual stuff.