Player's guns not making noise?

For the past week or so, every time a specific user enters my game, he shoots me without any noise coming out of the weapon that he uses. Is this a certain type of hack, or do I have an unfortunate coincidence of lag? My ping is 14ms, so I'm pretty sure it's not lag. Should I flag for hacking, or should I just let it go?
Best Answer
I think the guy probably have high ping and many lost packets. Also It can be a server fault (but if its Steam official it will probably not be), or you just have many lost packets, or ingame error - for me few times some textures and sounds dont work, but restarting game fixed it.
Pictures about "Player's guns not making noise?"



MOMMY LONG LEGS Falls in LOVE?! (Cartoon Animation)
More answers regarding player's guns not making noise?
Answer 2
Go to your steam library, right click on CS:GO and click verify game cache. This is most definitely an error to do with your textures and resources and a sound file or something missing.
Sources: Stack Exchange - This article follows the attribution requirements of Stack Exchange and is licensed under CC BY-SA 3.0.
Images: RODNAE Productions, ANTONI SHKRABA, Specna Arms, Pixabay