Avoiding Friendly Fire
When a target is next to a friendly character, i.e. someone the attacker does not want to harm or affect with their attack, range attacks becomes harder. The attacker has to be more precise with their shot to avoid hitting their comrade.
For each friendly character adjacent to or in the same square as the target, the target receives a 1d6 situation bonus. This bonus is in addition to any bonuses that the target may gain from the cover provided by the position of the allies.
Reference: Firing Into Combat, People in the Way
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