I used to work for and trained with Regis salons, they done the fouling like this as apparently it was 'quicker" I never found this, as especially with long hair it was awkward! The only time I found this technique useful was when the client (like myself) has a double crown... I'd foul around the crown like that as it stops lines as the hair parts. I would just do what you feel confident in doin 😊xx