After the commander sends Alain along with Mackintosh and the others to guard the fort, Mackintosh reveals that he had been sent to kill Alain as part of a deal to reimburse his father, who was left penniless due to gambling debts.
After the leader sends Alain and Mackintosh, along with others, to secure the fort, Mackintosh discloses that he was tasked with killing Alain as a condition for reimbursing his father, who had lost everything due to gambling losses.