With the blueprint projectile we have a collision mesh that is setup there. By having it set to collision events we can detect and set things to happen when certain things overlap with it. It may not seem intuitive, but it gives you, the creator, a great amount of control to setup your scenes to work in conjunction with assets the way you deem fit.
The main reason it’s setup this way with the projectile, is to tell the destructible that it can only take collisions when it overlaps with the projectiles collision mesh and vise versa. This is a good way to keep the destructible from falling apart or being destroyed by different methods.
If there is a particular scenario that you’re trying to accomplish feel free to post a new AnswerHub question and we can look at it there to provide some assistance if you’re having trouble setting it up.
Thank you!
Tim