I am going to guess that because Black is the dominate and blue is a dilute you will get all black torts or a mix of solid black and black torts. However there is that variable of "what else is hidden in the pedigree(or off the pedigree)?"
on the black tort buck ( tort, black tort, black otter, broken tort, blue tort, broken chestnut agouti, black, broken tort) are the colors of his pedigree