I'm just glad the person's face can't be seen. Though I imagine there is a high chance that there are lots of CCTV cams that might have. Hope the person is able to ghost, and that overwhelming fear takes hold for other C Suite folks at UHC and really all companies.
Likely subsonic rounds that have trouble cycling the action.
Edit: this is why if you happen to be stealthily doing adventurism you should use .45acp, it's subsonic by default and pairs well with a suppressor. In Minecraft.