That is exactly what I was trying to say.
How ever, you are missing the point that there are two extremes here, and there is an unclear line between these two extremes. I would probably also take my gun/knife as a self-defence in such cases, but, what if, IF the threat you saw to be a very serious one, maybe because of some specific (uncalculated) circumstances might end up to be a stupid joke?
As you should know, it is a gross sin to kill any innocent person. In fact, killing any believer intentionally will cause you to enter hell for eternity (with no mention about repentance in any surrounding verses, in contrast to the verse dealing with acccidental killing).
Also, see the following verses
2190-194
Fight in the way of Allah those who fight you but do not transgress. Indeed. Allah does not like transgressors.
And kill them wherever you overtake them and expel them from wherever they have expelled you, and fitnah is worse than killing. And do not fight them at al-Masjid al- Haram until they fight you there. But if they fight you, then kill them. Such is the recompense of the disbelievers.
And if they cease, then indeed, Allah is Forgiving and Merciful.
Fight them until there is no fitnah and worship is for Allah . But if they cease, then there is to be no aggression except against the oppressors.
the sacred month is for the sacred month, and for violations is legal retribution. So whoever has assaulted you, then assault him in the same way that he has assaulted you. And fear Allah and know that Allah is with those who fear Him.
Personally, if you really want a good answer, you should instead have to study all the quranic verses about fighting and analyze the words about the limits ordained to us. You won't find any better answer than what is found in the Quran.
First off Quran has stated that Allah forgives ALL sins as stated in this verse
"SayO My servants who transgressed against themselves, do not despair of the mercy of God. For God forgives all sins. He is the Forgiver, the Merciful." - 3953
So don't make it seem as if Allah won't forgive murder of a believer when this verse clearly states "all".
In regards to the verses you showed me, I do agree and I have seen these and the verses I layed out earlier. HOWEVER, the fact that there is a verse such as 528 really has me confused. Why is it that those verses say you can I think but yet that one says no I think. Thus I want to know what 528 might really means if those other verses are as said.
As for the killing of someone who was making you think like that due to a joke, well I think it would come down to intention. If one legitimately believes that what is stated in 532-533 is happening and you kill them, but only after to find it was a joke, I don't see why the person would be blameworthy as they honestly thought they were serious.
What I want to basically know in the end is why 528 has it like that when there so many verses that seem to allow for it as self-defense I think.
Of course, I may be wrong in all of this as i'm never sure 100% so if i'm wrong then please Allah forgive me.
Thanks