LOL, I just reread that with the Morgan Freeman voice in my head.
It would be a tough call for me, and I wouldn't try it unless I believed he was actually about to use the knife on her. Very scary situation and I won't say how well I would do, but I would do and not freeze. I of course inserted my wife into the scenario.
Great to hear stories with good outcomes. These SWAT guys were superb. Training pays big dividends.