Lawbot and the Case of the Missing Copyright Infringers

>You sneak around to the back of the building. Sure enough, there is a back door. You put your ear against it and listen. You can hear voices approaching. Just when you think the voices can't get any closer, you hear them veer off to the side.

What do you do?

Do you move along the side of the building, following the voices
or open the door, hoping that the coast is clear?