Run the vanilla game/singleplayer and change them there.

Seems like your game was not activated properly. Awc.dll is a part of EAs DRM if im correct.
Did you run the game before trying vu the first time? If not, that might was causing the issue.

Or maybe add to the killfeed if someone gets revived.

Did you test it on different servers? I'd guess it is some kind of issue with a mod, spectator or even advaned chat? Who knows.

You should probably create an issue report .

Maybe its possible to lower the actual bullet origin like they did with bf4.

A pretty useful option would be to compleatly disable knife animations/instakills since they only look cool but are gameplay-wise a disaster.

You can create a file called user.cfg at the installation folder of Battlefield 3 with the following content: GameTime.MaxVariableFps 100.000000 //fps cap, adjust if you like PostProcess.DynamicAOEnable 0 Render.DrawFps 0 //Set to 1 to disply fps counter Render.DrawScreenInfo 0 Render.PerfOverlayEna...

This was already discussed and I guess the conclusion was that this might be possible at some point but also pretty difficult to archive since there is no navigation data on the multiplayer maps and some other problems with it.