What specifically confuses you about the concept of a destructor? Destructors in BGT have incredibly few use cases because it's a completely managed development environment where all the housekeeping is done for you behind the scenes. The garbage collector takes care of freeing up any resources that might have been borrowed from the operating system in order to create your object.
The only use case I can think of is this: perhaps your game uses something like sound pool (for instance), and your class, which is an enemy, inserts it's sound in to the pool when it gets created (by the destructor). Now when the enemy is defeated by the player (or otherwise no longer needed), perhaps you might implement a destructor which remove's the enemy's sound from the pool and maybe even plays it's death sound. There it's being used as a convenience feature but it doesn't have the implications it does in more conventional programming wherein resource allocation and deallocation is a concern.
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