If the guitarist listed the sharps he'd know what key he was in. One sharp - G major (or E minor, listen for the difference) but not starting of finishing on a G major chord. Given that - and if I'd done that I'd have been on the correct chord - it does make me wonder whether insistence on describing some subsets of notes in a particular key as "modal" is deliberate or learned obscurantism.

As for "the shout" what happened to the old fashioned hand signals: one finger up, one sharp. One finger down, one flat. Two fingers up, two sharps. Two fingers down, two flats, and do on?