Sounds like there was conspiracy/premeditation. Possibly another Rittenhouse Revenger???
"..........Robin Redding said her son, Treshan Bryant, is a 12th grader at the school but stayed home on Tuesday. She said he had heard threats of a shooting at the school..........."
Maybe, but rumors of imminent school shootings aren’t all that uncommon anymore. OTOH there are no secrets in a high school, so maybe, maybe not.
"...if the gentlemen of Virginia shall send us a dozen of their sons, we would take great care in their education, instruct them in all we know, and make men of them." Canasatego 1744