How do you know the Serbs were about to turn on Slobbo?
By reading the news stories about the political unrest that was building in Yugoslavia at that time. Slobo was being challenged by several new political parties and the people were growing tired of his corrupt and incompetent economic policies. Once the NATO bombing began, all of those parties quieted down as you'd expect from a nation under attack.
Heck, even the Democrats in this country started acting patriotic for a short time after 9/11!