How can a young man on his way to yeshiva to put on tefillin and study Torah be murdered, if those engaged in a mitzvah are said not to be harmed?

This source-based Torah study examines the question: How can a young man on his way to yeshiva to put on tefillin and study Torah be murdered, if those engaged in a mitzvah are said not to be harmed? It follows the canonical Hebrew discussion through the weekly Torah portion and the Jewish sources cited there. This localized discovery layer is a concise abstract, not a full translation and not a practical ruling. Any halakhic, medical, legal, security, bereavement, political or other sensitive claim remains subject to the canonical review status and should not be treated as individualized advice.