"If a blood-redeemer comes to kill a murderer, and the murderer fights back and kills the blood-redeemer,..." (424)

Weiner, Rabbi Moshe. The Divine Code: Second Edition. Pittsburgh: Ask Noah International, 2011. Print.
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the murderer is not liable for the second death (424)
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the murderer is liable for two deaths
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if there are witnesses, the murderer is liable for two deaths