Santillana took advantage of the break and and as he tried to round Jim Leighton, the Scotland goalkeeper brought the Real skipper down at the expense of a penalty.
Juanito stroked the penalty home and for many, there was a feeling that the Dons' chance had gone.
90 minutes could not seperate the sides and with it locked at 1-1, extra-time beckoned and it was in those 30 minutes that this Aberdeen team would become true legends.
The superb Peter Weir's delightful chip down the Aberdeen left was followed by an even more delightful cross by Mark McGhee which evaded the Real goalkeeper.
And one flick of substitute John Hewitt's head later, the men in red had one hand on a European trophy.
Legend has it that Hewitt - who replaced fellow goalscorer Black - was to be hooked himself because he kept trying to run with a ball that was sticking in the soaking turf.
The manager is held aloft by Peter Weir and Doug Rougvie
Still, what did the management team know?
A late free-kick that fizzed just past Leighton's left-hand post was the final nervy moment as the Italian referee blew for full-time.
Legends had been made.
As Sir Alex Ferguson recently told the League Managers association website: "When you look back you say to yourself 'how did I manage to beat Bayern Munich who were the favourites and then beat Real Madrid in the final?'
"It was special because Aberdeen was a small club.
"I just had two girls working for me in the office, the secretary, a couple of people running the pools in another office. I had [assistant manager] Archie Knox, my reserve coach and a physiotherapist and that was it."
The Dons would go on to beat European Cup winners Hamburg in the Super Cup to cement their position as Europe's undisputed best in 1983.
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