How to create the cross boomerang from Castlevania?

Hi

I was just wondering if anyone knows of a good way to create the cross boomerang from Castlevania Rondo of Blood in Construct 3. It's a spinning cross that the player throws across the screen horizontally and after it has travelled a certain distance it reverses it's direction slowing down before it changes directions then speeding back up again after it has. I can get a bullet to reverse directions easy enough but I'm struggling to create the part where it slows down then speeds back up again.

Here is a convenient picture from the Castlevania wiki that might help illustrate what I want to achieve.

static.wikia.nocookie.net/castlevania/images/f/f2/SOTN_Cross_2.gif/revision/latest

Any help would be appreciated

Thanks

You would apply an acceleration (speed/time) towards the player while the projectile is out.

You can achieve that with the built in Bullet behavior.

1. Give the cross a negative acceleration when you first throw it out
2. Compare it's speed every frame, if speed is equal to 0 (or less than some really low threshold) then:
1. Turn the acceleration to positive
2. Change the angle of motion in the opposite direction

You'll have to tweak the speed and acceleration values to get the motion just right, but it'll work.