Before you go in, plant both feet and breathe out longer than you breathe in. Three times. That is enough.
If the question slips away, say it simply: “Let me rephrase to be sure.” That buys you five clean seconds.
A pause is not a failure. It is time to choose. Recruiters prefer that to an answer that goes everywhere.
Sip water if you need it. It is a professional gesture, not a confession.
After the interview, write down what stuck. That is material for the next mock, not shame to replay.