The Missing Apprentice

I have been training an apprentice, a young dark ranger named Prelus. He has proven an apt pupil and a quick study. But like many of the newly raised, he feels the draw of his old life calling to him. Prelus received a letter from his brother Auron asking to meet. I advised against it, but Prelus was insistent. He is long overdue to return, and I fear for his safety. This is the location of the rendezvous. Could you help me search for evidence of what transpired? This flare gun may reveal the truth.