What is the ruling when a below-the-neck injury, initially subject to Qisas (retaliation), is pardoned, but the injury subsequently leads to the victim's death?

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If a below-the-neck injury that mandates Qisas is pardoned, and the injury later spreads, causing death, Qisas for the death is not obligatory. This position is held by Abu Hanifa and Al-Shafi'i. The reasoning is that it becomes impossible to exact Qisas for the life without including what was pardoned, thus the Qisas for life is dropped, similar to when some heirs forgive. Furthermore, if an injury that initially warranted Qisas is not subject to it (due to pardon), its subsequent spread does not mandate Qisas, analogous to when the hand of an apostate is cut off, he then embraces Islam, and then dies from that injury.