He panics, feels around for a stone and hurls it at the brightest point. 
The sound of breaking glass echoes around the cave. 
As his vision is restored he catches sight of two golden gloves about one foot in diameter hovering away down the tunnel.
When they disappear a resounding crack sears across the roof, and it collapses all around him. 
Our hero is trapped once again.

'This is it' he thinks, failing to move any of the fallen rocks