Brownie, I'm not sure about #2 as you've stated it above. I don't think if I was approached by someone I knew was armed, such as a person walking up to me at the gas pumps with a knife in their hand, that I'm going to spend a single second trying to figure out what their motive is. It seems to me that I'd put your last quoted sentence into the #2 spot and leave figuring out the motive to police and prosecutors. Means, opportunity, and reasonable fear of death/GBH would be all I'm looking at to complete the firing circuit. Motive, not so much. How would I know the motive until they've acted?