Just 30 seconds before Sergi Roberto volleyed beyond Kevin Trapp in the PSG goal, Marc-Andre Ter Stegen - the Barcelona keeper - was fouled in the opposition half for the free kick which would eventually lead to the winner at the Camp Nou on Wednesday night.
The German had just stolen the ball off the toe of a PSG player eyeing up an unopposed route to goal. It was one of many moments where the miracle could have been stopped. Edinson Cavani and Angel Di Maria both had chances to extend the game beyond Barca's reach in the second half.
Barcelona beating that four-goal first leg deficit in the first place was miraculous. The manner in which they did it was even more so.
Understandably, the players were ecstatic - none more so than Leo Messi. After Roberto's goal, he ran straight to celebrate with the fans.
Leo Messi celebrates Sergi Roberto goal
Look at Messi celebrating Sergi Roberto's goal. Going mental with the fans. Pure emotion. Bleeding blaugrana. pic.twitter.com/tI8Lxyz9Jw
— Alex Truica (@AlexTruica) March 9, 2017
Barca manager Luis Enrique also celebrated like a madman for that Roberto goal.
— Isioma | Barça Lens (@BarcaLens) March 8, 2017