How would you all feel if I turned the tables and said it was June who'd " kicked off " ? As opposed to it having been Sheila,as whatever had happened to June to have received a black eye previously,,she was also under par,mentally and had the burden of worry over Sheila,the twins and also her husband who was beginning to feel ill with worry too. It's not impossible for June to have snapped when things got more heated,,and I think it was June.or even Neville who fired that first shot to Sheilas' neck.
It was definitely between the three adults.
Not forgetting the fact that because June could never bear children,that alone from her previous years would have left its mark,plus her own past treatment at the clinic/hospital.