Cade brought the Autobots to a cave where he knows they will be safe, just as long as they don't startle you. All the bots have shrunk to human size in order to follow.

Optimus: Cade, you mention not startling someone?

Tessa: Yeah, dad. Who is it?

Crosshairs: Probably some crazy human.

Bumblebee: Doesn't seem like a place a human would