Watch the guy down at the bottom left corner of the screen off a few yards from the road.
He stands up and turns around toward the group just before the explosion.
I can hear it now..........
In the huddle, "Now, Ackbar, carefully cross the green wire with the yellow ...... and gently insert it into the............."
From a few yard away, "Hey Ackbar, look at this cool rock I just found ........" ........BOOM!!!!!!!