Guardian Of Shadow And Light

The shadow children were playing on the wall.
Came the shadow child searching for the ball.
The sun was setting and it was getting late.
I had thought of leaving but it could wait.
"Help", cried the child; "We need our ball".
"The night cometh and darkness will fall!".
Earlier that day I had talked to the sun.
He told me the children were having fun.
We agreed the night was the great abuser.
Both victim and martyr were a chooser.
I searched until I found the shadow ball.
I bounced it and it hit the great wall.