agnieszka winkowski is visiting from connecticut and saw the rocks fall.agnieszka winkowski/visitor:"and it happened right over there where that little white point, i guess you can see."she couldn't believe the sounds and sights of it.agnieszka winkowski/visitor:"all of a sudden there was this humongous explosion, a lot of smoke.. it looked like a bomb that exploded. it was just huge."officials aren't sure of the exact size of the rock fall,but minutes later, a second set of rocks came crumbling down.melissa hortik: "all of a sudden as we were looking up there, there was more rocks that fell off, just to the left of where the original rocks had fallen. like bombs going off. it just echoes through the valley anyway.. considering how far away it was, it was very loud." this comes climbing season at yosemite..a reminder for visitors - that mother nature is unpredictable. (catherine) and the climber who was killed in yesterday's rock slide has been identified as a british man.the woman who was with him was the person who was injured. (catherine) we are learning new information tonight...