1)
What is the meaning of "va'Yachazek ha'Ish b'Pilagsho"?
1.
Radak: He forced her outside, to save himself.
2)
Why were they content with her? Initially they demanded her husband!
1.
Radak: Once they saw her, they desired her and were content with her alone. Malbim - this shows that they intended only for lust.
2.
Abarvenel: She was beautiful; from the beginning, they desired only her. They requested the man so he would [willingly] give her over. 1
1
To save himself. Had they initially requested her, he would have refused. (PF)
3)
Why does it say "va'Yed'u Osah va'Yis'alelu Vah"?
1.
Malbim: "Va'Yed'u Osah" is normal Bi'ah. "Va'Yis'alelu Vah" is Lo k'Darkah.