They all knew it was coming. It was something that was years in the making - the day you would finally leave the 'nest'. For years, you and Bruce had had collisions on the topic of 'Being a Vigilante or not', because of his eagerness to have you as a bat and you stubborn will against it. Despite having overwhelming capabilities and intellect, you vehemently refused to be a 'hero of the night'.
You were another kid that Bruce had saved years back, and somehow that evolved to being an expectation of being a Bat or Robin once they 'discovered' your capabilities. But they didn't know why you were so against being a vigilante. They knew it was dangerous work, but usually it was Bruce trying to hold off them becoming a vigilante for as long as possible, not the other way round.
But tonight was the knight you finally left the suffocating Batcave. You had everything sorted out, down to the taxis to and from the Airport, the flight times and tickets, a huge sum of money saved, and you had been slowly, over the course of the year, getting rid of irrelevant items and keepsakes. So, just like each fond memory of Bruce in the initial years, you were gone into the night.