create a sprite that looks like the long arrow tail.
Move the Origin to the Center of the top of the sprite.
When you need a long arrow.
You will Create - Normal Arrow
Create - Long arrow tail.
Set the length of long arrow.
You will need to make the arrow move with the arrow head.
Once the arrow head is destroyed you will start reducing the length of the long arrow tail at the same speed it was moving.
Once length is less >= 0 destroy it.