en_tn/gen/37/29.md

Reuben returned to the pit, and, behold, Joseph was not in the pit

"Reuben returned to the pit, and was surprised to see that Joseph was not there." The word "behold" here shows that Reuben was surprised to find out Joseph was gone.

He tore his clothes

This is an act of deep distress and grief. This can be written more clearly. Alternate translation: "He was so grieved that he tore his clothes" (See: rc://en/ta/man/jit/figs-explicit)