Q. While fasting, haidh begins. Is there qadha for this fast?
A. If haidh began after half the fast was kept, i.e. half the day or more, then qadha has to be kept otherwise not.
Q. If haidh begins while engaged in Salaat, what should be done?
A. Discontinue the Salaat. If it is a Fardh Salaat, there is no qadha for it. If it is Sunnat or Nafl, qadhaa has to be made.