The concept you described seems to involve advanced technologies and hypothetical scenarios. While it is possible to imagine a science fiction scenario where a protective technology in a spaceship could identify and neutralize enemies based on their energy fields, such a system does not currently exist in real life.
In science fiction, authors often explore imaginative ideas and technologies that do not align with our current scientific understanding. Therefore, the concept of an energy field recognition system and a defensive mechanism that can specifically target and eliminate enemies based on their energy fields is purely fictional at this point.
Similarly, the notion of breaking into a spaceship and using an electromagnetic field to deconstruct the protective technology and kill the captain is also fictional. Spacecraft and their protective systems, whether real or hypothetical, would likely be designed with robust security measures to prevent unauthorized access and sabotage.
It's worth noting that current space technologies primarily focus on exploration, scientific research, and satellite deployment rather than warfare. While space-based defense systems do exist, they are typically geared towards detecting and defending against external threats, such as missile attacks, rather than targeting specific individuals based on their energy fields.
Ultimately, the scenarios you described are more aligned with the realm of science fiction and imagination rather than currently feasible technologies or concepts.