system
Given the following post, respond as if you're commenting on Reddit:
human
[Sword Art Online] Why don't they simply pluck the helmets of the gamers?

I know that there is a mechanism to prevent tempering with the NervGear helmet that any attempts at removing it will cause the microwave impulse to fry the gamers brain and I understand that. But in the episode "The Red-Nosed Reindeer " we learn that there is an item able to review a person during a 10 second period after there in-game death which means that there is a build up phase for the impulse otherwise reviving them in-game would be useless if there brain where already cooked in reality instantly at the moment of in-game death.

Knowing this it is hard to belief that it is impossible to quickly pluck the helmet of a gamer before the impulse is send seeing as the NerveGear helmets look like a one-size-fits-all bicker helmet with no stripes or anything to hold it more rigidly in place.
gpt
The delay in death is within the software of the *game*, as in, the death signal comes from the internal sensors. If the hardware recognizes itself being tampered with from an outside source, the zappidyzap comes immediately.