The latest trailer has Harrison leading Kirk and Scotty down a narrow corridor. Kirk is armed and behind him
, so I have to believe they are willingly following while Harrison beats the heck out of a guy in the same outfit. Harrison kind of looks back over his shoulder at them like, "yeah - I just did that".
If we follow the continuity of it all and take into account that Harrison manipulates Kirk, apparently into helping... then once Harrison gets hold of command, he smacks down Kirk (as Carol Marcus looks on) and reveals his true intentions. Maybe using this ship as a 911 type weapon, crashing into SF. This might be a prelude into the crew going rogue and going after him on Kronos.
I don't know. Even after the leaks and trailers, I am completely unsure of how this all unfolds. Well played, JJ.