"Rise, Peter, and fulfill this pastoral office divinely entrusted to you as mentioned above. Give heed to the cause of the holy Roman Church, mother of all churches and teacher of the faith, whom you by the order of God, have consecrated by your blood. Against the Roman Church, you warned, lying teachers are rising, introducing ruinous sects, and drawing upon themselves speedy doom."
Well, since the Prots did not meet a "speedy doom", it would seem that Peter was either disinclined to hear Leo's petition or had need to attend to other, more important matters.
And given that the Prots went on to evangelize half the world and now account for roughly 2/5ths of Christianity (+700 million) - it would seem that the tree bore good fruit.
"33. That heretics be burned is against the will of the Spirit."
You guys really believe the Holy Spirit would have you burn folks at the stake???