Problem creating logics

I am attaching a file with just events!!!
You know a type of game, in which the player reaches a place where the camera no longer follows the player. now in that place the enemies are create in sets one after the other. Now in a set multiple enemies are created. I have created a system like that too. What I want is the enemies to be created, in a set, after 0.5 second interval of time.
Events are not working.gdg (81.6 KB)