This day's filming involved only two of us behind the camera and in front of it. The funny thing is both of us are named Mike.
Filming a scene with only two people presents many challenges. If both are in front of the camera, there is no one behind the camera to monitor the sound, position in the frame, light changes, etc. However, having only two people involved also saves the filmmaker from stress as well. Scheduling becomes easier, and there are only two people that can forget lines.
For this particular scene, we began by filming all of Mike's lines from a closeup angle, while I monitored behind the camera. Next we did the same with me in front of the camera. The final step was a two shot with no one behind the camera. It was not until I reviewed the footage again months later that I noticed, as the sun had set behind the camera, the shadow of the camera and tripod slowly appeared on my leg from shot to shot. Luckily, I was able to crop it out without any important information missing from the shot.