Describe the events that lead to Barty Gunliffe's accident

Answer :

One day there is a storm, and Barty gets in trouble because he is precariously perched on the rocks during the raging storm. ... Mally's grandfather was right, and the Gunliffes assumed his accident was caused by Mally in an attempt to murder Barty, presumably for gathering seaweed in Malachi's Cove.