Shit mate. Getting robbed when you're of uni age isn't cool.
Although, nobody has ever 'COME AT ME BRO' with a knife before so I don't feel I can say I would have acted differently. I like to think I would have punched up the two youts, moved everyone off the bus including the driver, tie the youts to the front of the bus and drive through their ends banging out 'YOU AINT A KILLER' by Big Pun as a message to the masses.