In Disciplined Agile, a good Team Lead (or Scrum Master) should act as a servant leader, supporting and enabling team members to succeed. When a team member is falling behind, the appropriate response is to have a conversation with the team member to understand what is getting in their way and work together to find solutions. This approach fosters an environment of trust and collaboration and helps to identify and remove impediments that may be affecting the team member's performance. The goal is to address the root cause of the issue and provide support, rather than assigning blame or creating discomfort.