It marks where you're gonna respawn.
This.
It marks where you will respawn
the next, and only the next time.
Pretty much all guns that are automatic, have a semi-automatic fire mode.
Since if I make guns, I will be making them moddable (add attachments like scope, rapid fire, extended mags, silencer, etc.) a feature like that would be easy to add.
BTW, the server is up, and uses all the content here I've finished so far.