Need Help with Sony Vegas Slow Mo

Im trying to edit a MW2 trick shot and i want it to slow down in one part of the trick shot but be normal speed the rest of the shot, but i can't only add slow motion to one part of the clip it makes me slow down the whole clip if i want it in slow motion.
http://www.youtube.com/watch?v=PYj8Ee8URLA
that is the clip im trying to edit and i want to slow when he pulls out the magazine then fast for the shots, then slow again for when he pulls out the magazine.
Can someone please teach me

 

Hold shift when makeing the clips lengthier will make them go slower.
(Dragging the clips to the right while holding shift)

 

To do this split the clip from the rest of the clip where you want it slowed then slow that part down.