However , the Doctor knows the TARDIS will not accept the paradox and is forced to leave the older Amy behind .
The Doctor wants to go back in time to rescue the younger Amy , but the older Amy insists that they take both of her .
The Doctor knows the TARDIS will not accept the paradox and is forced to leave the older Amy behind .
The Doctor wants to go back in time to rescue the younger Amy , but the older Amy insists that they take both of her .