I have been trying to understand why my student's code isn't working just to find this piece of code. Checking out code early in the morning is definitely not my thing.

Correct me if I'm wrong, but this could be valid right?

Because the function is an override method, the parent class could delete a group, which is overridden in this subclass because it is now allowed for this type. Not best practice, but could work right?

@LHofman does this violate the liskov substitution principal?

@craig939393 Not necessarily, but depending on the logic of the function in the other subclasses, the open-closed principle could be breached.