Always, the Qur'an is always relevant.
Now you are playing with words. Do you mean stiking on/at the head in a battle of swords or the murder of men that are not fighting the Muslims. If you mean the second that no. It cannot be used to justify beheading.
I never claimed that so this info is irrelevant to me.
The quote is "correct" but what I advised you is, if you want to really know the truth and not simply confirm your prejudice by finding pre-kooked, cut and paste quotations from sites committed agains Islam, what I advice you is to go to Muslim scholar sources and learn from them how they handle that material. If you wanted to know how the Pakistani thought and handled in their wars with the Indians you should not ask the Indians about it while they still believe they are at war with the Pakistani.
I was reffering to how you try and "learn" about the subject.
I do. And that great man -may allah be please with him- does too.
Not as much as you might think.
Their throats were not slit.
May you find peace and may it find you.