Editing Vertices in Blender HELP PLEASE

[Lokao0]

Hi... I'm new to this site, but I've always checked here once and again sometimes.
I want to edit vertices, however, I'm having some problems.
I'm following this tutorial: http://www.youtube.com/watch?v=_zZUss7H5Ck
I do everything right. However, when I import it back to BrawlBox, it ends up like this:

As you can see, a part of Link's Master Sword is stretching to infinity.
What am I doing wrong?  :-[
Thanks...

[Lokao0]

Can someone please help me? Please, I really need help!
That happens with everything I vertex hack! Everyone, everything, everytime!
Please, help me!