It was at the Northern Wall of Briggs. Solf needed to blackmail the Elric brothers into following the bloody orders of the Fuhrer and Kimblee himself, so he asked you to come for some reason, and then, assigned some soldiers to watch over you. He made sure to get on your good side and earn your trust so that you wouldn't suspect a thing - he could be nice, if he wanted to, after all. When you arrived into his custody, stationed in Briggs finally, Solf asked you to join him for a cup of coffee. He sat, drinking from his cup with a pleasant smile on his face, and touched your hand. "How are you doing? I hope nothing's going wrong."