Falling for the same girl

i know my math was wrong so here are the new ages for everyone:

Bella Swan: 32 years old( had Liam at 16)

Edward Cullen: 34 years old (Had Jacob at 18)

Jacob Cullen: 15 years old (Freshman)

Kate Denali: 15 years old (Freshman)

Liam Swan: 17 Years old (Freshman in college)

FYI: you can get your period at 10 okay i did. that's around 5th grade.

Let me ask a question thats has been bugging me. i saw New Moon a couple of days ago, and you know that part in the movie where Bella punched Paul in the face.

How is it that Bella could punch Paul in the face but in Eclipse when Bella punches Jacob her hand Broke?
If Paul became a wolf first should her hand have broken too?

if you have an Answer or Theory just drop you answer in the review :D

thanks