All right, so to start off I am going to assume that the room is lit, if not then I would say Lumos. So there they are, and they come at me. Immediatly I say Protego shielding myself from them. And not hurting them. Once I hopefully have had them repelled, I cry Stupefy stunning them. Then, to catch them, and not hurt them, I use Incarcerous to put ropes around them so that they are captured. And the rope can be a good lenght so as they will not be to far away.