How to animate throwing?

[compact pond]

While working in the program, I wanted to make a monster that can throw its spears, but how to do it in terms of animation? After all, during the animation, you can't hide the spear, and it itself is constantly moving in flight because of the animation of the hand.

This is a small animation of throwing and I can't have 2 problems:

1. How to make a projectile disappear? After all, in Minecraft, in fact, another projectile will appear as a separate model, and here this model is in the animation itself, how does it work at all?
2. How can you normally hold the projectile in one position during the animation of the hand itself?

[barren grail]

you can scale it to 0 at the lastkey frame

didnt got the 2nd problem

[compact pond]

Thank you, you helped me)