Well in that case, rather than jumping to conclusions, perhaps it would have made more sense to ASK what type of cell it was? As we can now see, it was an alkaline cell, so the danger from the leakage is quite small.
As great a resource as CPF is, I'm a bit disturbed by the amount of posts that spread FUD (fear, uncertainty and doubt) that are then repeated ad infinitum by other members.
I've read the threads on The dangers of CR123 exploding batteries OMG!!! Get your HAZMAT suit!!! Frankly, the risks are overstated here on CPF when it comes to toxicity of a vented or burning cell. Info gleaned from reading an MSDS by someone without a background in chemistry, medicine, or battery technology was blown far out of proportion.
The amount of truly toxic chemicals generated during these infrequent CR123 "events" is small, and without some other underlying health issues, most people would feel only minor, if any, ill effects. By all means, open a window, let the air clear, but that should take care of most of it. The potential fire / explosion that can occur, on the other hand, is something to watch out for.