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I have a feeling that Ar was the "Bull" because he was trying to resist... and a submachine gun is also a more lethal weapon than just an assassin's pistol.
Added 2 minutes later
And a player with natural defense shouldn't selfishly ask the only city defender to absorb the damage for them. But that's not 100% proof, of course.
Added 7 minutes later
Oh, I came up with an interesting idea: Nera is Grim, who tried to recruit Anta. That's why the method of murder is strange. Plus the pipe in the picture, plus the spontaneous murder - not with a garrote or a firearm, but with bare hands. And that explains the repeated lack of evidence - because evidence is not given for self-defense killings. The only questionable point in this case is the 90% and the moving of the body.