Finally another question - if the querant is combusted (as in this case) does this mean that the answer to a horary is always "no"?
No. It depends entirely on the context of the question, and everything else that is going on in the chart, because it would be unwise to take any configuration in isolation and explore it as distinct from other factors.
It is not impossible for combustion to be what you may hope to see.
One of the effects of combustion, is that the combusted planet is rendered invisible, and if I was a spy on a top-secret operation hoping to remain undetected, then my significator combust might not be too bad a sign, particularly if the Sun ruled the tenth, hence describing my illusive career and representing those above me who are responsible for arranging my disguise.
If I wish to know whether the steak will be very well done as I have ordered it (although we would never ask such trivia, but for the sake of example), then what better than to see the significator of the steak applying to combustion?
The textbooks will tell us about accidental debilities, and though these things may always be of the negative polarity in nature, such things do not always equal 'bad', and while it may generally be the case, it isn't altogether true.
'Accidental debilities', while they will always be called that, might actually fortune on the querent according to the context of the question that has been asked, as with our example of the spy combust by the ruler of the tenth, and so rendered undetectable by his superiors.
I just wanted to say try not to have a blackened view of many 'accidental debilities', which is a general principle and not a Draconian stricture. Accidental 'debilities' can often work well within our favour.
Thus, my missing object represented by a retrograde, one suggestion of the item's eventual return, cannot be bad.
If I am asking if the person who killed my loved one will stay in prison for the rest of his life, finding his significator in partile conjunction with the South Node on the twelfth cusp, then these are serious accidental debilities for the quesited, but not for the querent, for whom the 'debilities' cannot be considered such as they bring us to the answer that the querent would have hoped for.
The same goes for accidental dignities. If a person is morbidly obese and must lose weight on pain of death, then finding the querents significator in partile conjunction with a well dignified Jupiter, might be called a 'dignity' by the textbook, but it is still apparent to us that the influence is highly detrimental to the querent's life.
I just wanted to make the point, that just as malefic planets are 'negative' but do not always equal 'bad', then accidental debilities, while always on the negative polarity, are not always bad either.