The rebound spun wildly across the box, chaos in motion, as both Cubarsí and Saliba threw themselves into the scramble.
Two desperate stretches, one from each side, but it was Cubarsí who got there first, his toe nudging the ball clear a split second before Saliba's outstretched leg clipped him across the ankle.
The Spaniard went down with a cry, clutching his shin, and instantly the referee's whistle split through the noise.
Foul.
Saliba threw his hands up, irritation written all over his face as Arsenal shirts around him protested, swarming the referee, but before anyone could say much more, Koundé snatched the loose ball, setting it down and swinging it forward in one motion.
No hesitation.
The Arsenal players froze in disbelief.
The whistle was still echoing in their ears, but the play had already restarted.
The Barcelona bench leapt, shouting for their players to go, go now.
