"The boy pitched the lump,shattering it on the rail above his head,the fragments fell on his face" what does this mean?

This sentence describes a boy throwing a lump (presumably a solid object) which then breaks apart when it hits a rail above his head. The broken pieces then fall onto his face.

The sentence describes a boy throwing a lump of something, possibly a ball or a rock, at a rail above his head. The lump hits the rail and shatters into fragments, which then fall on the boy's face.