In order to keep Mel from wandering off again he's been given the camera. This should keep his mind on something else.
However these "director wannabees" start getting big ideas when they're *behind" a lens so things should start getting pretty wild.
Here Paul has been standing like this for 5 whole minutes whilst Mel gets the light 'just so'. That's not a smile it's a rictus.
Paul's actually saying
"Hor hucks hake, Mel, hake du hucking picture"