Oh no! It sounds like something happened to Dave and he may not be functioning as expected. Without any specific context or information about the situation, it's hard for me to give any meaningful advice. However, I advise that you stay calm and try to troubleshoot or find a way of recourse on how you could fix up the issue (if possible). Either way failing when figuring out assumptions using necessary models and data is a natural predictor for trying again but this time presupposing salient concerns within established standards recursively weighing in on foundating premises bringing recovery speeds up over nominal amounts too