Death due to illness
In the prasna section of Kala, under Guidelines for illness, it is said when moon is between malefics and in the 8th house, it will cause death.
When we talk about durdhara yogas we don't consider Ra/Ke. for the combination above, kala's search actually includes Ra/Ke. So it it correct to assume Ra/Ke are considered malefics for the above combination ?
Yes, for between malefics rahu and ketu are generally included. However, in prasna they are not, so I would not predict this if caused by rahu and ketu.