The Bamfs were starving, and so Azazel fed them his blood which in turn changed them and remade them in his image. Now with a legion of soldiers bound to his evil will, Azazel used them to raid Heaven for souls, but one of them was left behind and was found by Nightcrawler who made him a deal of his own which yet again changed them from red to blue. When questioned by Firestar about the deal, Nightcrawler only reveals that it wasn't his blood that he promised them but it was something his father could never match.