I get why Sheridan had to reprimand Lyta – except that she is not part of his command structure and is under no obligation to uphold his command decisions. But she even calls him 'sir' so she's compounding things herself. Sheridan really should have brought her under his command in an official capacity if he wants her to follow his decisions. I suppose it would back up Garibaldi's viewpoint, that Sheridan is building his own little fiefdom and dictating matters to everyone. It just seems a little naive of Sheridan (or perhaps arrogant) to assume Lyta is under his command.
his reasoning makes perfect sense!