Sometimes I am too pithy. I should have said that I lost beyond the loss limits because of my own folly.
Suggesting that a spike in the VIX caused my losses misunderstands my strategy in a significant way. Worse yet, in order to try to be "one of the boys" I was sloppy in using this terminology myself.
The fact that VIX increases when the market moves rapidly and makes the management of existing trades more challenging, is an effect, not the cause of the problem. Were I to focus on the effect and not the cause, I would be trying to manage with a lagging indicator.
The cause of my losses was that the underlying overtook my short strike. The cause of the losses being greater than the strategy limits was my not maintaining sufficient cash reserves to buy back ALL the spreads that reached their loss limit.