I havent played with gith girl but im a battle master myself, and when i use the abilities requiring the superiority dice roll they do use that dice, and i have encountered a situation in the dungeoun where i attacked another battle master here's what happened:
I hit him for something like 18 dmg he ripostes, and misses , my guy ripostes on his riposte and does another 20 dmg crit, the guy is dead.. 2 superiority dice rolls used, total.. first one on the ability 2nd on riposte.
You can turn off riposte by left clicking on it same with the other ability dont remember the name of it, all characters have it.
