What deduction is taken if a coach stands between the vault and the board?

When a coach stands between the vault and the board during a gymnast's vault, it interferes with the execution of the skill and the safety of the gymnast. The deduction of 0.5 is specifically applied in this instance as it signifies a significant error that can impact the performance. This deduction recognizes that the coach's presence in the landing area could potentially distract the gymnast or cause an obstruction during the execution of the vault, which is taken seriously in gymnastics judging. The deduction emphasizes the importance of clear boundaries and proper coaching practices to ensure both the safety and performance quality of the gymnast.