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WATCH: UFC Champ Conor McGregor Bare-Knuckle Boxes Europe's Strongest Man

When the stakes are this high, it pays to be light on your feet.

Although UFC Interim Featherweight Champion Conor McGregor is deep into training for the biggest title fight of his career, against Jose Aldo at December’s UFC 194, he still found time to mix it up with a freight train disguised an enormous human.

WATCH: The Mountain meets his arm-wrestling match

While Hafthor Julius Bjornsson - Gregor 'The Mountain' Clegane to Game of Thrones fans and Europe’s Strongest Man to everyone else – had a size and reach advantage usually not seen outside dubious birth certificates in junior rugby league, McGregor still got a couple of shots off.

He’s no slouch in the punch department, either.

Still, it was hardly a fair fight until Bjornsson sank to his knees.

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Watch the video above for the complete action – including the moment one of the punches seemed a bit too strong and The Mountain looked ready to unleash.