It's not really that unheard of. That is exactly what 'opportunistic' predators do. If they see a sudden opportunity to grab a child or a vulnerable person, they will do so.
They don't need to know the person. They don't even need to have actual sexual relations---just the act of kidnapping, creating fear, using some kind of force or violence, is enough of an arousal and satiation.
And it is not unusual for the crime to be over in an hour or two. And not unusual for it to happen in broad daylight. That's usually the only opportunity to find children alone---during daytime. Look at how many kids get taken going to or from school. They are often taken by strangers.
The only odd thing is the possible staging---although we don't really know what exactly was or wasn't staged.
I remember reading about two brothers, about 11 and 12 or so, who were fishing in a stream, and lured into the woods by a nice stranger---who tied them to a tree, SA'd and killed them.
Sounds kind of similar to Delphi killings. Killer was a stranger, who went 'hunting' for vulnerable victims that day. Broad daylight, left stabbed and tied to a tree.
en.wikipedia.org
On September 4, 1989, Dodd went to Vancouver's David Douglas Park, with a fish fillet knife and shoelaces, and sought out young boys to kill.
[6] He lured two brothers, 11- and 10-year-old Cole and William Neer, to a secluded area, where he forced them to undress, tied them to a tree and performed sex acts on them both. When he was done, he stabbed them repeatedly with a knife and fled the scene. The boys were soon discovered in the park. Cole was dead at the scene, while William died en route to a nearby hospital.
[1]
www.bbc.com
