This is my own recording I did for my game that never got completed. Begine an indie game developer, I had to do voice-acting as well haha. The files have "Hey" cound when the NPC is alerted, and after a delay "I will kill you" signals that NPC has recognized us and is now attacking.

Feel free to use it in your work & if you liked it, I'll love if you support me on my free game development tutorials. I make tutorials on different game mechanics and full game development cycles.