This was retaliation for ongoing bullying. The big kid is a bit mentally "slow" and just lost it but he got his revenge.
It was BIG news mate, on all the current affairs shows, news etc and caused quite an outcry and focused on protecting kids at school etc - it really brought the problem to attention. Of course the media loved stirring the pot cos they had vision of it and played it over and over.
The little kids parents were banging on about their boy hadn't done anything wrong etc etc and that the big kid should be punished...yeh right.
If I recall correctly, it all just faded away and the big kid got left alone.