According to the PMBOK Guide, the risk response plan is the set of actions that the project team will take to address the identified risks. The risk response plan should be reviewed and updated periodically throughout the project lifecycle, as new risks may emerge or existing risks may change. The risk owners are the persons assigned the responsibility of monitoring the risks and implementing the risk response actions. The risk owners should work with the risk manager and other stakeholders to evaluate the effectiveness of the risk response plan and make any necessary adjustments. In this case, the risk manager should ask the risk owners to review the risk response plan and see if there are any alternative or additional actions that can be taken to deal with the delay caused by the external team. Starting a quantitative analysis, crashing the schedule, or transferring the risk are not appropriate actions for this situation, as they are either too late, too costly, or too risky. References: = PMBOK Guide, 6th edition, pages 452-453; The Standard for Risk Management in Portfolios, Programs, and Projects, page 79.