What was the moral problem Elisha was facing?

Elisha has to deal with his moral qualms concerning the shooting of a British soldier that his Zionist group has taken hostage. A Holocaust survivor, and someone whose family was murdered by the Nazis, Elisha is keen to fight for the establishment of a Jewish homeland in Palestine, which at that time was part of the British Empire.
But although he's absolutely committed to the cause of Zionism, Elisha finds himself struggling with his moral conscience when the order comes through to execute his hostage. Elisha is deeply troubled by the thought that he will become an executioner if he follows his orders, much like the Nazi executioners who murdered his family.
To make matters worse, Elisha feels somewhat insecure in his relatively minor position within the group; he always feels that the others are keeping him in the dark. In any case, Elisha has until dawn to wrestle with his conscience, a task made all the more difficult by the appearance of ghosts from his traumatic past.