Rhys remains surprisingly quiet; not what John had expected at all. It seemed that, despite his naturally cocksure and smug attitude, the Black Raider knew when to straighten up and take the situation seriously. A hardened soldier who was well aware that war was no game.
The redhead quickly moves on ahead of the group, disappearing into the room beyond, a ready finger on the trigger of his rifle. Whether he did this to scout the area or as a simple act of defiance against John's leadership, the Major wasn't entirely certain.
"Got somethin' here," Rhys relays over John's comm channel. The Black Raiders had already infiltrated their networks. Though it wasn't entirely unexpected he had hoped it would take them some time to bypass Aria's firewalls. Sneaky bastards.
John and his men proceed into the following room to find Rhys at the far end standing over what appears to be some kind of corpse. As they approach it becomes apparent that's exactly what it is. Rhys kicks it, a piece of frozen flesh calving off and shattering as it impacts with the ship's floor.
"Had some nasty ass holes punched in her," he comments rather passively, pointing with his gun towards an emergency seal door. "Either that or she was vented..." he adds as an afterthought, the accusation clear in his tone.
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Sarai's exceptionally talented when it comes to technology. Her honed reflexes −as well as some incredibly advanced neural upgrades −allow her to respond at a rate which makes combating an AI possible. Having the best technology money can buy off the black market doesn't hurt either. 
Though it took a little time, Sarai was able to integrate certain Black Raider networks with a number of Horizon's own networks, including support networks [such as comm channels] without detection. They haven't done anything harmful though. Don't worry. They're just trying to... keep an eye on things. 