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I'm also of the impression that this was just a random and terrible event. Granted, I've never used public transportation in Texas. Public transportation in New York and New Jersey can get just as hairy, but still, events like that are few are far between.

As to course of action, given the facts as they've been presented here, I would not have felt compelled to draw my weapon unless the shooter was continuing threatining behavior. Seeing how he walked to the back and took a seat, I would have felt comfortable just keeping on eye on him so I could point him out to the police.