The model may use Shooting Attacks towards enemy units Engaged in Combat, with the following rules and restrictions:
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Friendly units Engaged in this Combat are ignored for Cover purposes (but not for drawing Line of Sight).
Roll to-hit as normal against the intended target. Immediately after determining the number of hits, roll a D6 for each hit. On a roll of 4+, the hit is distributed onto a randomly chosen friendly unit Engaged with the original target. Otherwise, proceed as normal.
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