Im not sure this is a bug, but see this video for better understanding.
When Valentine got hit by Love Dart and the first hit of Best Friend Forever bb2, Valentine can stand up then defy the second hit of BFF bb2.
Link video: https://drive.google.com/file/d/1OgVjDpAIV-BMZ9O8XVHtwFIo0wDEL4WE/view?usp=drivesdk
When Valentine got hit by Love Dart and the first hit of Best Friend Forever bb2, Valentine can stand up then defy the second hit of BFF bb2.
Link video: https://drive.google.com/file/d/1OgVjDpAIV-BMZ9O8XVHtwFIo0wDEL4WE/view?usp=drivesdk