From what I’m reading rules as written, it would seem one could combine Murder with Basic Combat Tactics by spending all the relevant mind and making the appropriate call. Relevant parts bolder below.
Murder (from lexicon): If the damage attached to a Murder effect is sufficient to put a target into bleedout, it is also considered a killing blow
Combat Tactics: …an individual may spend 1 Mind point and while performing a killing blow state “double tap, killing blow”…
I’m making sure that this is actually supposed to be a thing people can do. I think it makes sense but wanted to check.