The metal bar is held during thermolysis when the electrologist chooses to work in automatic mode, having nothing to do with galvanic or blend. If the electrologist wants you to make contact with the metal bar during thermolysis, it is being used as a sensor, not a ground.
Arlene Batz, CPE: Educator, Board Certified Electrologist, NYS Licensed Esthetician. Discount coupons for HairTell readers. http://endunwantedhair.com