I haven't seen anything in the media with respect to this case that fits your description in the bolded. Sadly, there are too many shootings and too many types of shooters over the past several years. No doubt this murderer will slot into some of those preexisting categories and elude some others. One common denominator, of course, we know.
I know Boulder well and I am sorry for those who will bear the brunt of yet another mass shooting, and for all of those who will live in fear of the next one. The banal, everyday activity that turns into a lethal, horrifying scene of trauma and loss -- our kids practice this at least once a month, the modern-day version of the old duck-and-cover, though hopefully more effective.
How soon is now?