Pointless Digression and other teachers reading this, be prepared to talk about it today or this week in a faculty meeting. Last night every school board around here that met had school safety as their number one agenda item. Likely your principals and school police officers received directives to review their campus' safety plan and speak with the staff about it. I want you to be aware that this meeting is likely to happen, it's likely to be emotional and it's likely to bring to mind some horrific mental pictures for you. It could also be scary as people point out gaps in your building's access security. Pointing out a problem doesn't mean it's going to happen. It just represents an opportunity to fix the problem.
Remember, you're a person and have the right to feel however you do. If you can model calm and empathy and support for your peers, please do so. They need it. If you are the one who needs calming and reassurance, please seek it. You need it. And don't be reluctant to walk out if you're going to lose it and don't want anyone other than your closest school friends to know. There's no shame, there's no wrong in being you.