 Endoscopic procedures of the esophagus are complex and require careful monitoring by anesthesiologists due to the potential for serious complications. During one such procedure, a patient experienced ventilatory impairment 15 minutes into the surgery. The anesthesiologist noticed this and recommended clipping the area where the lesion was removed to prevent further damage. This allowed the surgeon to complete the procedure safely with no further complications. This article was authored by Hyun Joo Heo, Ji Hailee, Yu Yeol Kim and others.