Make a spear to jab enemies with

So am trying to setup a spear that do a quick jab. In the direction it's facing (currently being rotated by mouse in my most recent setup). Here is a diagram to show what I mean

Current code setup (not great and pretty buggy). Rotating it works fine just moving it between 2 points is what am having problems with.

 void Update()
 {

     RotateSpearWithMouse();
 
 if (pushSpear)
                 {
                     transform.position = Vector2.Lerp(transform.position, pushTransform.position, (Mathf.PingPong(Time.time * pushSpeed, 1)));
                     pushSpear = false;
                     canRotate = false;
                 }
     }

push spear is being set to true when player clicks the left mouse button. Then push transfrom is a gameobject attached to the spear in the editor. The spear also will rotate towards the mouse. Code to that here

 private void RotateSpearWithMouse()
 {
     Vector3 mousePos = controls.Player.MousePostion.ReadValue<Vector2>();
     Vector3 spearPos = Camera.main.WorldToScreenPoint(transform.position);

     mousePos.x = mousePos.x - spearPos.x;
     mousePos.y = mousePos.y - spearPos.y;
     spearAngle = Mathf.Atan2(mousePos.y, mousePos.x) * Mathf.Rad2Deg;

     if (MouseLeftOrRight())
     {
         transform.rotation = Quaternion.Euler(new Vector3(180f, 0f, -spearAngle));
     }
     else
     {
         transform.rotation = Quaternion.Euler(new Vector3(0f, 0f, spearAngle));
     }
 }