She clicked "Simulate." The screen transformed into a ghostly 3D walkthrough of her building. She watched as rain seeped through a misaligned flashing, then a beam sagged, then a wall cracked. In the final scene, a family walked into a lobby—and the ceiling collapsed exactly where the father stood.
"Your beam-to-column connection," he said quietly. "That’s not in any textbook I’ve seen." She clicked "Simulate
And in the margins of her PDF, a new note had appeared, handwritten in blue ink: then a beam sagged