During the fight in the Inquisitors' fortress, Kenobi's light saber bounces off a storm trooper's armor.
The Inquisitors are said to be so confident that no one would be stupid enough to attack their base that they don't even bother to shield it, yet the interior is crawling with seeker droids and stormtrooper patrols.
Tala tells the security chief that she is his commanding officer, because she outranks him, and therefore he should address her as "sir." A commanding officer is someone who has direct authority over an inferior officer through a straight chain of command. As she is outside her sector and has no direct authority over the Inquisitor base, she is not his commanding officer. She should have said she was his superior officer, as she outranks him, even though she is not his direct commander.