Actually, I never really thought of it that way.. The inciting incident, as you have correctly identified, is part of an action sequence:
In my story, one of the twins is the unwitting adopted son of a mob boss who only learns the truth that his only boy is not his biological son but the son of a suspected junkie homeless woman who gave birth the same night his wife gave birth. The mobster confronts the doctor and nurse about their "crime" of switching his real baby and demands they tell him what happened to his real son 16 years prior.
Basically, the doctor was tasked for caring for the mobsters wife during her late stages of pregnancy and that fateful night when his wife started to complain of abdominal pain, the mobster demanded the doctor make a house visit and check her out, despite having been there only a few shorts hours earlier, just before his shift at the hospital.
Around this time, a call comes in to prepare for the arrival of a pregnant homeless woman struck by a vehicle. Due to the complexity of the trauma, only this same doctor and his trusted head nurse have the expertise to save the woman and her babies, which they do. But in the confusion, the mobster's wife gets worse as the mobster waits for the doctors arrival to his home.
But he doesn't show... He is busy saving the life of the homeless woman and her babies.
The mobster's frantic efforts to reach the doctor are in vain and he finally takes his wife to the emergency room himself, but the damage is done.... the mobster's baby will eventually die and his wife's life hangs in the balance as she has lost a lot of blood due to a placental abruption.
This is why the nurse and doctor colluded 16 years ago to switch one of the homeless mother's twins with the mobster's dying baby in the NICU to avoid the wrath of the mobster who would have held the doctor responsible for the death of his biological son . But after 16 years, their deadly secret comes out...
When the mobster learns his real son died due to complications arising from a placental abruption hours after his birth, the fates of both the nurse and doctor are pretty much sealed. The mobster's wife, who knew the truth, years earlier (call it a mother's intuition and confirmed by the doctor) withheld the truth from her murderous husband but with her health failing and on her dying breath, she tells her son that she cannot protect him any longer. Before he can get further answers from his dying mother, she passes away. Grief stricken, he runs away but not before he makes a visit to the doctor's home (who happens to be a family friend) as instructed by her mother's last words ...
When he arrives, his father is already there with the intent of killing the nurse and doctor who are also present at the doctors home. There is an action scene and the nurse and doctor are killed, but the son barely manages to escape ... only to be hunted down by the mobster and his thugs.
It is during a future chase scene that one of the enforces chases the twin into an alley and the two twin brothers collide with each other.. that's how they meet...
-pause- (google says it is in NY, cool!)