Maybe I need to get back in the sim and practice, but I don't see that you are doing yourself any favours in terms of further airspeed increase by rolling to 91 degree of bank in preference to just momentarily releasing the controls and re-instating the hydraulics at that point. Maybe more chance of your colleague re-instating the switches promptly as his eyes might be open rather than closed at the sight of a 91 degree bank angle via Boeings " letter-box".
I guess in theory the bank angle "should" help contain it, but the time spent rolling & then unrolling the aircraft might be better spent just promptly unloading/reinstating HYD power ASAP ? Just my feeling.
Tough old Bird the 737
440 . . . Vmo plus 100 phew
