"because he afflicted her": to include an orphaned girl (as receiving the fine). From here they ruled: An orphaned girl who was widowed or divorced, the ravisher is liable (for the penalty); the enticer is exempt.
"he shall not be able to send her away all of his days": but she may be released from the levirate bond.
(Devarim 23:1) "A man shall not take the wife of his father": From here they ruled: A man may marry the ravished of one's father and the enticed of his father. R. Yehudah forbids the ravished of his father and the enticed of his father, it being written "A man shall not take the wife of his father."