Sorry, I'm not buying it. So, you're on the approach at say 400ft and 55kt in a -13. Want to descend quickly? Full brakes and lower the nose - a 13's brakes are speed limiting. Or, as Step suggests - a very steep side-slip with full airbrake.
The whole thing sounds incredibly fraught - if not dare I say unbelievable. Upside down at 300ft, and then he handed control back........