Boren knew that nothing good could be expected from Boon. Even though Boon had never been physically stronger than Boren, he had built his reputation as a merciless tactician by torturing his enemies and sometimes even his own soldiers. No one could resist Boon's will because hesitation could cost lives. Boren, in contrast, had earned his reputation as a reliable but strict general through years of serving side by side with the same warriors, enduring the harshest battles, cold, and hunger together. No one could resist Boon's will because hesitation could cost lives.
Right after Arlena left, Boren personally cleared the path after them. Despite elves being cautious and dragons being quite bad at navigating the woods, he didn’t want to leave any chance for them to be followed. The risk was too high.