sense that we know more of what it isn t than what it is essentially at this point. normally when it s an attack in new york, we re talking about something in manhattan. this would not be unusual at a subway stop, but why here? this stop isn t something you would think of for a terrorist type or larger type plot, which is meant to be more spectacular. second, we have not heard anything in terms of motive. we don t know who the shooter is. we don t know why they did this or why they picked this location. why this train, why this car, why today. none of that has really within explained. it s not clear from the evidence left behind. if you re trying to inflict mass casualty, why would you detonate smoke, which makes it harder. why would you wear a mask? the targets, that s the other part we usually use to solve what this is, if it s a personal target or criminal target, that oftentimes is sporadic. but this happened at rush hour, which seems kind of specific.