Faced with Cathleen (Julia Watson), the worried mother of his ex Aidan Moore (Geoff Dignan), John had a vision of Aidan derailing his wedding to Aaron Dingle (Danny Miller).
But, desperate to conceal his dark crimes, John insisted he wanted, and needed, to come with her to the hospital.
At the hospital, John secured some alone time with Aidan.
"No," argued a vulnerable Aidan. "You," he added as he discreetly tried to use the button for emergency assistance.
John caught Aidan and stopped him, before taking out a syringe and hovering menacingly over him.
Turning off Aidan's monitor, John revealed he would inject the man with air, which would go unnoticed by the medical staff – but Aidan would suffer.
But, at the last minute, John was unable to go through with his plan to kill Aidan.
A returning Cathleen was distraught, while Aaron arrived to confront John over what he thought were John's lingering feelings for Aidan.
Can John turn things around? And has he thwarted Aidan for good?
5 Emmerdale spoilers next week: Nate's body is found and will Ruby confess to murder?Emmerdale's Oliver Farnworth teases killer John's future after wedding week nightmareCoronation Street and Emmerdale confirm bumper crossover episode for new 2026 schedule launchEmmerdale's Olivia Bromley teases Dawn's future: "Her days could be numbered"Emmerdale airs huge Joe Tate update as suspects are issued a warningEmmerdale's Mackenzie's 'life's in jeopardy' from villainous John
Emmerdale airs Mondays to Fridays at 7:30pm on ITV1. Stream on ITVX.
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