yeah with a fault in the canopy mechanism the risk of pulling that handle might be bigger than enduring hours baking in the sun, although I suspect he'd have the aircon going (they do have one in a multi-gazillion-dollar fighter plane, right?)..
of course one would suspect that the ejector seat wouldn't trigger unless the canopy had been successfully fired off, but with a fault in the canopy mechanism it would take one courageous (read suicidal) airman to pull that handle
..plus, of course, why risk getting shot in the air and having to rely on more systems and circumstances like a suitable landing space if there's big men with cool tools around
