Swapping out foreach out of behavior

Summary: Ref T8300, swapping out foreach out of behavior

Test Plan: no user facing changes

Reviewers: #blessed_reviewers, epriestley

Reviewed By: #blessed_reviewers, epriestley

Subscribers: Korvin, epriestley

Maniphest Tasks: T8300

Differential Revision: https://secure.phabricator.com/D12980