Locking Palpatine in his office

Why: I think that there should be a line spoken by Anakin to Mace Windu that explains why Anakin left Palpatine unattended after finding out that he’s a Sith Lord. It could be placed somewhere in the conversation where Anakin tells Mace about Palpatine’s true nature and it could just be a quick, “He’s locked in his office,” or something along those lines.