As far as I know, this can be done one of three ways:
1. Turn off brick damage and add the event OnProjectileHit | Self | FakeKillBrick to the bricks you want destroyable
2. Turn on brick damage and set the respawn time to 1 for the bricks you don't want broken
3. Turn on brick damage and add the event OnBlownUp | Self | Respawn
If there's an easier way to do this, I'd like to know too.