help needed for orbs

[littlepea]

Hi all.. i'm pretty new to photoshop..

i came across this really nice tutorial on glassy orbs.

but i got stuck at step 10.

can someone explain to me how to remove the portions of the orb that aren't required?

here's the link to the tutorial.http://photoshopcafe.com/tutorials/orbs/orbs.htm

genuine help needed.

thanks