Vic's hypothesis:
Something I have not heard mentioned (although I'm a few pages behind yet..) is that this is Tennessee's statewide spring turkey season (April 2 - May 15, 2011 -
http://www.tn.gov/twra/turkeymain.html).
Anyone familiar with turkey hunting knows that they are very perceptive birds and that you have to be very stealthy and in FULL CAMO to hunt them.
This time of year in Tennessee (and my part of Ohio) NO ONE would be suspicious coming out of the woods in camo, especially if the perp came from the adjoining property not owned by the Bobo's.
The perp used this as a ruse of some sorts to get Holly to the woods with him. One scenario that immediately came to my mind was
Perp(knowing HB is a nursing student..), "My friend is shot/injured/bleeding/etc in the woods"
Holly, "I'm a nurse let me help..."
The brother looks out the window and sees the perp and Holly going into the woods thinks it's boyfriend and heads to shower. They stop in the woods for Holly to call 911. Perp knocks phone to ground. Holly screams, heard by neighbor but brother is in shower by this time.
One thing not clear to me is where the cell phone was located. Barn or woods? I've heard both. The above scenario would fit either barn or woods.
Sorry for the ramblings. Was just had the turkey season pop into my head, went & looked it up and sure enough, smack middle of season. Wanted to get my thoughts down before they escaped my mind lol.