Small Boy Rescue From River Escape

A boy is struck on a tree in the middle of a river. Both the sides of the river are closed by walls so he can,t just reach the shore that easily. The actual danger is it has been announced throughout the villages nearby the river by loudspeakers that the flood water will reach the river at anytime since there has been a heavy rainfall in the neighboring state. You should find a way to help him climb the wall so that he can escape before the flood comes