A project manager works in a hierarchical organization.

Organize a team meeting and inform the team members that, as the person accountable for delivery, they decided to change the task allocation.

Ask the less experienced team member privately to stop working on the task and inform another team member that the work has been reassigned.

Ask the more experienced team member privately to take the task and inform the other team members that work has been reassigned.

Organize a team meeting to inform team members about a change in direction and work with them to change the task allocation.