To me it seems to be right in front of him and not that far back.

You can see the distance and height from the angle of its reflection when it flicks on, and past that all that changes is the lens flare moving as the camera changes its angle. It's further back in the room, around and at the same height as the top of the object sitting by the door.

Prepared audio is trivial to play when you don't have to visually sync it to something. The only bit that we can sort of assume was set up to be live (and even that could be faked by just responding in advance to things he or an assistant ask while the footage is being streamed) was the initial bit of him talking to people in chat, after that it would be trivial to just kill the audio and leave a prearranged track playing until the stream cuts off.

So we know how this could be faked easily, and we know that there just aren't things that do that and certainly not things that leave cameras miraculously untouched while doing that, a big steel cylinder that's light enough for him to move and set on some thin pieces of styrofoam isn't going to be shielding anything, he clearly doesn't actually get through the steel with his drill, and the seeming "threat" is a blue light that happens to be on top of a thing he had sitting behind him that just sort of turns on but is apparently not threatening or injurious enough for him to drop the drill instead of carefully placing it beside the apparently menacing object before turning to look at the blue light and fall just so so that the camera is covered and he'd be free to do whatever once it was muted.

We're left with two possibilities then: either he faked it, or he was killed by a magic blue light that was polite enough for him to turn around first and which then simply ended him without any sort of radiation or electrical discharge that would interfere with the camera. Or he set out to fake it but then just randomly had an aneurysm and collapsed by sheer coincidence right at the spooky setup moment.