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Who was Derek Reese going to kill?

In S02E09 of Terminator: The Sarah Connor Chronicles, Complications, Jesse has captured a man she believes to be Charles Fischer (a notorious Skynet collaborator) and is trying to convince Derek to kill him for it.

Eventually, the man admits he is Fischer and Derek points his gun at him and the following exchange takes place:

Derek: I don't remember. But she does, and that's good enough for me.

Fischer: So. You gonna kill me?

Derek: Not you.

[At this point, Derek turns around to where Jesse and the other hostage are]

Image of Derek turning around

[A gunshot is heard. It is then revealed that Jesse fired the shot and killed Fischer]

But I can't figure out what he meant by "Not you", was he going to kill Jesse, or the other hostage (that they later released), or perhaps someone else?

Derek obviously didn't know what Jesse was going to do, or he would have said "Not me". And I don't think he was going to kill the other hostage as they didn't indicate that they knew he was the young version of the same man.

Are there any clues given later as to what Derek's intentions were?