This seems to imply that the young man took very little time to think about what he should do. Alternate translation: "He quickly decided to go after her" (See: [[rc://en/ta/man/translate/figs-explicit]])
The naive and unsuspecting way the young man follows the adulteress is compared to the way two animals are unaware of the danger they are in. (See: [[rc://en/ta/man/translate/figs-simile]])