Additionally, the context of your question is unclear, and mentioning "borderline" without further specification makes it difficult for me to understand the situation accurately.
If you are referring to an event or incident involving a 5-year-old and someone with borderline personality disorder (BPD), it's important to remember that BPD is a mental health condition, and not everyone with BPD would engage in harmful or violent behavior.
People with BPD, like individuals with other mental health conditions, vary greatly in their thoughts, feelings, and actions. While some individuals with BPD may struggle with emotional regulation and impulsivity, it does not mean they are inherently violent or dangerous. The majority of people with BPD do not commit violent acts.
If you have concerns about a specific situation or individual, it's important to reach out to appropriate authorities or seek professional help to ensure the safety and well-being of those involved. Violence and harm to others are never acceptable, regardless of the mental health conditions of the individuals involved.