Communicating with the client point of contact during a penetration test, especially when a testing component crashes a system or service, is crucial for remediation. Remediation involves the process of correcting or mitigating vulnerabilities that have been identified during the test. In the context of a system or service becoming unavailable, it's essential to promptly address and resolve the issue to restore availability and ensure the continuity of legitimate business operations. This communication ensures that the client is aware of the incident and can work together with the penetration tester to implement corrective actions, thereby minimizing the impact on the business and further testing activities.