One reached down to pick up a stone, then several others.
A young boy picked up a stone and threw it at her.
He turned round, saw me and picked up a stone.
She picked up a stone and tossed it into the water.
Without knowing why, he bent down and picked up a small stone.
It's true that some of these children may have picked up a stone or a gun.
I told Jane that this boy, with nothing better to do, would pick up a stone, as boys will.
Without thinking he reached down and picked up a large stone.
He picked up a stone and placed it right at her feet.
Which is to say he wanted to pick up a stone.