Did Varg Vikernes really kill Euronymous in self defence?

I watched Until the Light Takes us and read Varg's account of what happened. Based on that you would be pretty compelled to believe that he attacked Euronymous in self defence, lost the head a bit and killed him, but otherwise it wasn't premeditated. Then I watched Once Upon a Time in Norway and now I'm not so convinced by Varg's story. I think if he knew anything about Euronymous, which he did, he would know that Euronymous was mostly bluster and very little substance. So I think he killed him because killing people at the time in the BM scene accorded status, eg Faust, and Varg wanted that and probably got too drawn into his Viking warrior imaginary persona. Euronymous' death threat was just the excuse to act on these factors. The problem with the case is that the Norweigian establishment probably had it out for him, with the whole church burnings thing and the political rejection of Norweigian society. So the facts may have been twisted, eg glass fragment wounds being turned into 24 stab wounds. However, if you read Varg's account it's quite chilling, he said he kept stabbing him from behind as he was running away screaming, so who is to say he didn't stab him 24 times, rather than the 4 he claimed, if he was capable of doing that in the first place to someone who was in retreat and posed no threat? Also the way he boasts about having covered his tracks after the murder makes me think he is a total sociopath such that anything he says has to be taken with a large pinch of salt.