Irreducible characters and normal subgroups in groups of odd order

If b is a p-block of a normal subgroup N of a finite group G of odd order and b⁎ is its Brauer correspondent in NN(Q), where Q is a defect group of b, then for any p-block B of G over b, there exists a natural height-preserving bijection from the set of irreducible complex characters of B lying over height-zero characters onto the set of irreducible complex characters of the Harris–Knörr correspondent B⁎ of B over b⁎ lying over height-zero characters.