well, both explanations fit, plus here I give thy a new reason.
He might have gone through some preparation to get into the carbonite. He would have died otherwise.
So the three work out toguether.
It lured luke.
Vader vent his feelings (the one I like the least)
It was necessary in order to get Han into the carbonite, though Boba was still worried he wouldn't make it.
BTW. hello ^^
Originally posted by Bartman99
The "in order to lure luke" theory isnt that great though.
so why didnt he torture Leia,?
Cuz Han was a smart ass, and second, torturing a woman is kinda too dark and evil even for vader and lucan wouldnt sink that low. just think about it, what if he had. there would be no pint to freeze han, remeber that Boba fett was the one who wanted han, so it was a plus that vader got to torture him as well as lure luke at the same time.