Forum:Chain Ruling

Just had a duel with my friend in which I synchro summoned, he activated "Solemn Warning", I followed with "Seven Tools of the Bandit", he then used another "Solemn Warning" insisting my monster was still destroyed by the second "Solemn Warning" because it was part of the chain. I of course objected to his claim since his card can't counter my trap. Eventually I won that battle but he won the duel. Anyway what I want is actual proof of who is right because I believe we may face this problem again.