I hate to say it, ~n/t~, but I don't think it was officially declared why he was home. We heard he was out of school for something...and then we heard he had been home to attend a concert or something. If we heard the truth about it, I can't recall.
I think Holly may have thought she could handle the situation, at least initially. Yes, she was brave not to wake Clint...but we do know a neighbor heard her scream loudly. So she was startled. But I think, as I have said before, she may have recognized the individual and thought she could somehow get out of it.
Perhaps because of her naiveté, she didn't realize how terribly bad the situation was. I don't think for a moment she had dealings with these guys...so she figured, if she knew this man, she could eventually calm him down and walk free.
Shefner, CB, was home to complete an assignment for school. Imo, HB knew immediately that she was being abducted and likely fought the attacker, who imo was ZA. A sexual predator's first rule of prey is to gain compliance of the innocent victim.. The blood on the carport is an indication that HB resisted the attack and was violently attacked either with physical force or weapon, likely a knife...JMO
Imo, many of the items located during the search were items secretly left behind by Holly Bobo; leaving a Hansel & Gretel type trail... Hoping for a rescue by Law Enforcement, which tragically never came...