McRage wrote:...sanguinor grants all units within 6" an extra attack so that would work with any other squad and characters. This ability is used and measured for in the beginning of tha assault phase when the extra attack is beeing used).
"The beginning of the assault phase" and "when the extra attack is being used" are two very different times. The latter is the correct one, per the
FAQ ruling on the Blood Chalice/Sang Priest benefits.