Of course he could use a location with open shade and avoid the ugly fill flash look all together, which is what I'd want from a large format Zone System kind of portrait. If I wanted a flash going off in my face I'd just get some yahoo with a digital camera to spray and pray.....
Just saying... they probably want you to shoot their portrait because you're a fine B&W large- and medium-format film photographer. If you have limited experience with flash, why mess things up? Stick to with your competence and strengths - save the experiments for Guinea Pigs.
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