When you have less than 3 arrows in your magazine, the red feathers of the arrows pop up through the weapon model.
They disappear when reloading, but only when the reload animation finishes so they are removed out of nowhere.
Founded in 2004, Leakfree.org became one of the first online communities dedicated to Valve’s Source engine development. It is more famously known for the formation of Black Mesa: Source under the 'Leakfree Modification Team' handle in September 2004.