Unless it's extremely tempermental, the spike should continue to develop.
This presumes that there was no unseen damage done to the spike during the
fall. I've even repotted in bloom in an emergency with little harm. If it's
a grex I really like, I'll frequently pot up a 1-2 p-b segment in a 3" pot
with seedling mix and a clip to hold it in place. Unless the p-b is
extremely dehydrated or the dormant buds at the base are damaged, you should
get new growth in anywhere from 20-60 days. I generally have about an 80-90%
success rate with backbulbs on catts and cyms.
If you're going to try, I would make clean cuts, soak in Physan, treat cuts
with your favorite treatment (mine's sulfur powder), and pot. If it's a tall
one, you obviously need some good support. With shorter ones a small bulb
clip will do.
Gary

"GrlIntrpted" wrote in message
news
I was taking the orchid to be watered and it fell out of my hand. One P/b
with a leaf and about 5 strands of roots (about 2" in length) broke off
from
the tree fern square that the orchid is mounted on. The plant is in
spike.
Though the p/b that broke off from the rest of the plant was not attached
to
the p/b that is spiking, I am wondering if this breakage/impact can
somehow
cause the plant to go into shock and prevent it from flowering. I also
wonder if I should just toss that one single p/b or should I pot it up? if
the later, should I mount it or pot it up?

Mariana