In my book there is the text:
Chad climbed the familiar trail and higher where the plane had plowed through. He carefully arranged the sheets of metal in the form of a cross. No one in the air could mistake that for crash debris. It would be obvious someone had put them there on purpose. If searchers saw them, it wouldn't be long before they spotted the plane wreckage with the fresh grave off to one side and the little encampment fifty feet to the other side.
Can you explain to me why author was using to-the-side construction rather than on-the-side construction? It's matter because in the book I've stumble upon the text with on-the-side construction ("on" instead "to"):
"Back off from the mouthpiece a bit there, son. What's your location and situation?"
Chad was so excited he was shaking and couldn't slow his words. "We're in the valley on the other side of Bime!"
How I can understand when I need use "to" and when "on"?