There had to be a spell to kill his enemies.
Juraj and Besim fled the Concordance of the Hearts of Magic, clinging to the hope that there was a solution. The question was what it would cost Juraj and Besim.
They weren't strong enough to free the world by themselves. Besim feared that it would take Juraj's death.
Juraj and Besim needed a miracle if they were to save to world and set everyone free.