The Difficult Dynamic Handler

Help me handle this difficult person or dynamic professionally.

The person/dynamic: [DESCRIBE THE BEHAVIOUR, NOT A LABEL]
The impact: [ON ME, THE TEAM, THE WORK]
My relationship and leverage: [DESCRIBE]

Provide:
1. What might be driving the behaviour (without excusing it)
2. How to separate the behaviour from the person in my response
3. Concrete ways to address it directly and professionally
4. How to protect the team and the work while I do
5. When and how to escalate if it doesn't change

Focus on the specific behaviour and its impact, and give me language that's
firm without being personal. Flag if this crosses into HR territory.