The phrase "unseen enemy" refers to an adversary or danger that cannot be easily identified or detected. It refers to a threat that is hidden or invisible, making it difficult to fight or protect ourselves against. Full definition
But it does work, nevertheless, and proved very handy at giving advance warning of incoming enemies, or a general idea of the direction of incoming bullets from unseen enemies. (techradar.com)
Even though the fixed camera angles can cause some frustrating moments from time to time where unseen enemies will cause you some unfair pain, it's still an excellent action game today. (consoleob.com)
With these new features, Falcom not only moved the series forward but also prevented one of the most common issues of third person action games: getting hit by unseen enemies. (wccftech.com)