The fact is this poor kid wanted to paint the lines, took the risk and somehow didn't hear the Goose flying around the bend. Same thing happened to Bingo, he made a wrong judgement while corssing the lines.
It was 9:30 at night, trains run on mainline unitl past 1am so if you're going to paint that early you have to be quick and spot each other.
Regarding the laws and legal wall debate.
There are plenty of arguments for and against legal walls. There's a government study on it that included community views, police, writers, the lot.
No one's to blame, no amount of legals will stop people bombing the lines, insides, doing panels etc.
Lesson from this (once again) is be careful on the lines. Learn the system better and watch out for your mates.
Condolences to his family and friends.