As Seifert entered the school compound through the smaller of two gates he was observed by three crossing guards who mistook him for a mechanic trying to repair the gate's broken lock and asked him what he was doing there. Seifert ignored them and, after blocking off the gate with a wooden wedge, proceeded towards teacher Anna Langohr who was teaching a group of girls in sports at the schoolyard. When Langohr, who knew Seifert, asked if she could help him, he ignited his flamethrower and attacked her and the girls.