unboundaried, exposed and unprotected, far from watchful eyes. The field means the outside world, as opposed to the presumed safety of the home.
Cain mysteriously lures Abel into the field and kills him. Rashi and Sforno — who were surely not only children — have this to offer as commentary: Sforno makes the simple, practical suggestion that being in the field means being away from parental supervision.
Rashi suggests Cain started a quarrel with Abel, any quarrel, to be settled “outside”. He understands that there are dark forces at work between brothers — he will later place the epic childhood struggle between Isaac and Ishmael in a field.
The danger is most starkly represented a generation later in the bitterest conflict