en_tn/pro/06/15.md

Therefore

"For that reason"

his disaster will overtake him

This implies that the disaster is chasing him like a person or an animal, and that it will catch him soon. AT: "his disaster will catch him" (See: rc://en/ta/man/translate/figs-personification)

his disaster

This refers to the disaster that will happen to him, but also the disaster that he himself caused.

in an instant; in a moment

Both mean the same thing, and one or both of them can be replaced by "suddenly" or "very quickly."