for the benefit of the prayer.
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The permissibility of killing any harmful creature—whether vermin or something else—during the prayer or outside it; for if it is recommended to eliminate these noxious animals in prayer, then doing so outside the prayer is even more appropriate.
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Movements within the prayer are excused when aimed at killing such harmful creatures, because one must act swiftly before the opportunity passes, just as in rescuing a drowning person, extinguishing a fire, or warding off an assailant. Since these situations vanish once their moment is lost, the Law allows them even in the midst of worship.
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The ruling to kill these two “black ones” is not on account of their very selves but because of their hostile, injurious nature. Therefore, it is recommended to eliminate anything that harms; whoever harms by nature may be lawfully killed.