[rich2202]

G4 prevents a Drive Team member from extending any part of the body in to the Field.

G37 says the Drive Team may not contact anything outside their starting area (castle, spy box).

So, as long as you are not holding anything, you can extend outside the starting area, as long as you are not extending into the field.

One possible interpretation of G38 is: If you are holding something, if that something leaves your starting area, then you are contacting something outside your starting area, and are in violation of G37. This would prevent you from extending mutton into the field.