He knew the moment he was losing control of his magic. His hands were shaking and that’s when he saw the chandelier fall from the corner of his eye. The next few seconds moved rather slowly. Malfoy waited for Hermione to notice something and stop the chandelier midair, but she was too engrossed playing with Teddy to notice she was in fact in direct line of hit. When he realized she was in danger, he brushed Andromeda aside tried to lift it by magic again.