Alright, I apologize for the delay. @Goret and I have had some time to go over the logs and review the events throughout the round. We've both independently come to the conclusion that there was sufficient reason for Locke to kill Ethernet, so it was by no means gank. Furthermore, we've concluded that there was sufficient escalation throughout the round leading up to the death, as Ethernet pretty much told Locke that if they didn't kill Imran (at the time, but later Ana), they would be exposed to the authorities, as well as several other conversations throughout the round.
In the end, it comes down to whether or not Locke reacted reasonably to the threats Ethernet put forth, and we've determined that they did so. Just how a security officer can be killed if they walk in on an ongoing crime without the antag having to sit there and monologue, the antag should be prepared to be killed if they make threats that could reasonably be met with lethal intent. In this case, the antag in question threatened Locke with blackmail that would lead to their destruction if they did not comply, but it backfired due to the actions of several other characters.
If there are no further concerns, either Goret or I will mark this complaint as resolved and lock this thread in 24 hours.