Quote from Hello_Dollars:
Angus, the graph doesn't look quite right to me. With virtually any ATM backspread done in a 1X2 or better ratio that I've ever looked at, the max loss would be minimal on any one day move (assuming there's more than a few days to expiry). The only thing that would alter that would be a very signinificant vol crush. So I'm assuming you've modeled one. However, I'm not sure that's a reasonable assumption in this case in light of the speed and magnitude of the real (and projected) price decline.
As with any long gamma/delta neutral strategy.