The Enemy plane in this tutorial also has a lot of events and actions so you should take care and make sure you apply all of the necessary
events and make sure they have all of their actions exactly the way they are pictured here. Take note of the list of Events in the picture
below and click on the corresponding links to see how that event is structured.

First, in the creation event, set the vertical speed to 4.

Step Actions My Plane Collision Bullet Collision

Step

Collision with My Plane

Collision with Bullet