I was cycling. One of my classmates used to bully me. He came and threatened me to lend him my bicycle. I agreed. He went there to call his friend. Till that time I tampered with the chain. When he returned with his friend, his friend insisted on driving first. Before I could say anything, his friend took the bicycle. As soon as he started paddling his leg slipped, the chain came out and he fell. His head hit a rock and he died. Am I liable?