walked away unknown and forgotten into the ghostly daze of Chinatown soup alleyways & firetrucks, not even one free beer,
The person survive unscathed? That's hard to believe, but the other part of a "ghostly daze of Chinatown" is possible. However, "ghostly daze"implies like being under a narcotic. Maybe after jumping off and surviving this is how it felt? In ghostly, I imagine walking with no purpose through the narrow empty streets of Chinatown, dazed out for sure-- at peace.
The fact that the person does not get one free beer in the last part of these verses implies that the person who jumped off was broke, or just did not have money at the time. Notwithstanding that predicament, it's the person's need for empathy -- through a free beer-- that proves that the person that jumped off and survived is still controlled by forces outside theirselves. What would I do if I was eating at a ramen restaurant in Chinatown and was asked for a free beer, but first I needed to hear their story of jumping off the Brooklyn bridge and surviving before begging for the mercy of a beer?