perhaps they climbed a sport route up to the bench at the top of super slab and tried to rap with one rope  
  
well if they were sport climbers shouldn't they have lower themselves    
  
the bolted climbs left of super slab are ~300 ft long.  
  
I actually have no idea what route they climbed or descended.  Just seemed like a possible scenario.   
  
i didn't know sport climbers knew ow to rap, i thought they just listened to it