Graham Sharpe felt dizzy and his vision turned yellow then he fell, breaking his collar bone.
Luckily a heightened emergency services presence for presence for the US President's meeting with the King at nearby Windsor Castle meant paramedics were quickly rushed to his aid.
Graham, 65, said: "The police had put a message out that they needed a defibrillator and an armed response vehicle on standby nearby had one. It took two shocks to restart my heart.
"Joe Biden and his entourage were in Windsor that day to visit King Charles.
"So really I have both of them to thank for saving my life!" Graham, from Harrow, North West London, is supporting a final push towards victory for the Daily Express crusade Complete The Circuit.
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Esta historia es de la edición November 15, 2024 de Daily Express.
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Ukraine's humble legend giving hope to soldiers fighting on the frontline
USYK REVEALS HOW HIS TITLE WIN WAS RELAYED TO TROOPS
BACK-UP KEEPER IS ONE KELL OF A JOB
Slot knows being Alisson's No.2 is tough for Caoimhin
Howe makes winning a trophy talk of the Toon
EDDIE EMBRACING THE IDEA SQUAD CAN END LONG WAIT FOR GLORY
Bell strikes as feeble hosts fall apart
ENGLAND skittled South Africa for just 64 as they powered to a 286-run win in the one-off Test in Bloemfontein.
Stokes vows to return stronger than ever before
INJURY WON'T HOLD SKIPPER BACK
Running a chippy fried Price's brain
FOCUS NOW BACK ON SPORT
All coming together for rising star Jones
UP-AND-COMING trainer Jack Jones will have all his horses under the same roof from the new year after completing a deal to buy Rae Guest's Newmarket stables.
Barclays loses motor finance ruling legal challenge
BARCLAYS has lost a legal fight against the Financial Ombudsman Service over a ruling that it unfairly paid commission to a car finance broker over a loan.
Budget sparks 13% jump in insolvencies...with more due
BUSINESS insolvencies rose 13% in November, with experts warning worse is to come.
Fortunes-telling for 2025
MILLIONS of Britons will be anxious about what 2025 has in store as the economy slows, energy bills climb and inflation remains stubbornly high.