I think that the ability to be self-assurred about their own decisions and thought processes, and a confidence that their own plan is correct (both good and bad decisions). Both Michael and Burt both were able to and wanted to take charge and make the choices for the tower. It is something you saw also in Angel when he was in a really tight situations.
Also, right before Riley left she was writing in her journal. I wonder if she left it behind?
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