It is getting into silly season. The better weather seems to trigger something and being able to hang around outside for longer gives more opportunity for these things to happen.
It's all daft and you'd easily dismiss it as japes and laughs if it was just a bit of fists and posturing.
It's no different to when I grew up and boys from different schools had fights. There was always the odd nutjob, now it's "who's got the knife and feels scared".
It is getting into silly season. The better weather seems to trigger something and being able to hang around outside for longer gives more opportunity for these things to happen.