David Raya was over in one corner of the goal, having just saved a penalty. Mateo Retegui - the man whose penalty was saved - was licking his lips at the chance to make up for it by heading into an empty net.
But suddenly the net was not empty anymore. That is the story of how Raya performed a remarkable double save to deny Atalanta.
"It's probably one of the best saves I have seen in my career. He was unbelievable," said boss Mikel Arteta after the goalless Champions League draw in Bergamo.