Your other one was easier - rehearsing possible courses of action but hesitating through fear in the event. They called me "Spock" at school: I would think through all possible outcomes of an event of a conflict, so I would know what to do when it happened. This didn't help in proportion to the amount of effort I put into the planning, as a) in real life there were a lot more random factors and b) I would overthink the possibilities.

Picturing Spock Bridget, deciding what to do if she saw someone getting mugged or attacked - what if they turn on me? What if they have a concealed weapon? Sometimes the people fighting are "friends" are gang up on anyone who intervenes. What if it's just an argument, and they tell me to butt out, or I've embarrassingly misinterpreted the situation?

I don't do that any more. I found the Bridget of Now turning to then Bridget of Then, cowering and wrestling with the statistical probability that she can't help, saying "Damn your logic, I've got lives to save!" Somewhere along the line I've turned into Bones. I'd like to think I'd jump in with feigned self-confidence to ask if help is required, or to threaten with police. What course of action would I take? - the one which, in hindsight, I would most regret not attempting.

This scenario looks more like a Kirk thing, and I'm no good at Kirking ;-)
Plus, lots of questions like What will the Enemy do when it gets in? Kill me, hurt me, or just take my stuff? Is there any grounds for a compromise? I will assume a handy deus ex machina is out of the question, as is suddenly discovering the ability to fly. What do I think is sufficiently important to go in the inner fort? Also, I'd have had ten years to think about what to do in this situation.