Your question is Ownership of a Critical Production Bug. Take a moment with it on the right.
Talk me through your thinking if you like. When you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes).
Tell me about a time you took ownership of a critical bug that was impacting the user experience. Briefly explain the severity, how you investigated and prioritized the issue, who you involved, and what changed afterward. I am looking for a specific example showing personal accountability, sound judgment under pressure, and follow-through from detection through prevention. Structure your response using Situation, Task, Action, and Result, and quantify the outcome where possible.