At 2-2, Atletico Madrid pressed for a lead in the closing minutes.
The match was called off after what appeared to be a fruitless corner from Atletico.
But at the same time as the players began to trudge off the field, the referee was called to the VAR scare to look at a hand situation at the corner.
The result was a penalty awarded and a lifeline for Atletico Madrid in the pursuit of the CL play-offs.
But then everything went wrong for the home team, who could not take advantage of the penalty or subsequent return opportunities.
Watch the chaotic scenes in the player above.