What interference results in a deduction of 0.30 during a baby giant?

The deduction of 0.30 during a baby giant specifically applies when there is a failure to maintain an overgrip. The overgrip is crucial for the execution of the skill, allowing the gymnast to properly control their movement and maintain balance throughout the maneuver. If the grip is not maintained correctly, it can lead to instability and a deviation from the desired technique, thereby impacting the overall execution. This deduction reflects the importance of grip in achieving the necessary body positioning and fluidity for the skill.