Kill the orcs

A question for Indy: in Orc Fort you get an option not to kill some of the orcs..what is the meaning of this option if in the end the fort is blown up and everyone dies anyway? 

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RPGeez wrote:I am playing from scratch in hard mode and been playing for 25 hours.
I only have 5 quests fulfilled
2 animal kings eliminated
7 of 32 secret rooms found. Still no air sandals and of course some better equipment.
I am a little lost finding all the Orcs. I knew it would be a challenge starting from scratch and it is turning out to be in some ways right up there with Laxius Force.
Are the Orcs in the "Forbidden Zone" I cannot go there yet.![]()
I am still in the Eastern Territory.