Here's a look at dealing with the kids and how they handle stuff like this.
http://shtfschool.com/survival-psychology/traumatized-kids/ The author is some guy who lived through social/political upheaval that involved shooting at your neighbors because they thought the wrong thing. He needs work on overcoming his first language's grammar structure but that does not really detract from the readability. (I apologize for the fact that you are going to be asked to buy his course. He's in the business of making money off of his personal opinions. Good gig if you can get it.
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"Grief counseling" is not what folks there need. After losing good employees to PTSD and PTSD-like issues following incidents in the prisons they put together a three-stage mandatory program: 1) go (as soon as possible - no later than 24 hours) as a part of the group (as many as possible of those directly involved - guards, nurses, counselors) to a stress debriefing session - short, sweet, just a place and a chance to hug folks and note that you were glad to still be in one piece and, oh yeah, it sucks that ___ got ___ed. 2) invividual stress debriefing. This was the time and place for folks who never-ever showed emotions to break down and cry. It was allowed, but no pressure was put on anybody to try and force them to "let it all go." 3) formal PTSD counseling - with a bias towards group sessions. Administrative time off was provided for steps 1 and 2, and up to 16 hours was provided for step b3 so people could either come in late or leave early to get to sessions. Step 3 sessions were covered under the agency Employee Assistyance Plan for up to 10 1-hour individual or 20 group sessions.
What are the chances of those kids and teachers getting anything even remotely like that, instead of "You poor victim" therapy? Slim to none, if you ask me.
stay safe.