Nevrius

The way I understand the chain of events, it happened as follows: The Ebon Hawk got attacked by a Sith Warship manned by Sion and his assassins, possibly because it carried Kreia (this is just speculation, though). The Harbinger with the Exile and the HK-50 on board detected it and moved to intercept. The Harbinger later tractored in the Hawk and searched the Warship, where they found Sion's 'corpse', but nothing else. However, the assassins decided to board the Harbinger, abandoning the Warship, where they started sabotaging stuff, probably in order to get to Kreia and eventually found out about the Exile. However, at around the same time, either Kreia or the HK-50 (not entirely sure, haven't played the game in a while) incapacitated the Exile and moved him/her onto the Hawk in order to escape Sion and company. T3 was probably still on board and most likely was the one who locked the HK-50 in the cargo hold. After detaching, the Ebon Hawk attempted to escape the scene, and the Harbinger, now under control of Sion, opened fire, which led to the Hawk being damaged, and presumably Kreia being injured. T3 later managed to get the Hawk to Peragus, where the HK-50 got out of his compartment, at which point the main plot begins.