Bran continued circling over Beth, thinking about what to try next. He selected a lightning spell, causing the air around his body to crackle and spark. Bran brought his arms and wings in tight against his body, and turn to face Beth. As he dove, the trail of sparks followed the metal blades on his boots. At the last possible second, he pulled up, flying close enough to Beth that she could touch him, if she were fast enough.
The trail would follow Bran, until he pulled out of the dive. At that point, the sparks would fly off his boots and land on or around Beth. Once they touched her, or the ground, a bolt of lightning would come down from the sky. Since Beth was likely made of conductive materials, the bolt would be almost guaranteed to hit.