Go and find Emma

Trying to make the best of the situation Sam mutters "Right" under his breath before marching towards the front door and out into the drive way. He's half way to the van when he quickly glances over his shoulder to make sure no one has followed him out.

Seeing that the coast is clear Sam makes it to the camper van, and rests his hand on the door. Should he knock first, or should he just march right on in?