Oh, just realized I misread and hadn’t realized that you brought up the needle. Sorry, was on my phone when I typed that.

If it had been a beast of some kind, it sounds as if it was easy to overcome. Perhaps it was something that, as opposed to most forms of evolution where bigger and scarier was usually a more desirable trait…had evolved to remain hidden as a survival mechanism? Implying that they may be physically weak or at least fragile, explaining how you were able to send it running multiple times and kill it with ease despite the fact that it had the tactical advantage of being literally invisible.