I'm never said it was impossible to do. Just that is usually requires some intention and planning to make it work. But yes, given the right kind of unplanned events to randomly happen in the right order and in a very specific way, it is possible for something to happen that would cause the attached atomizer to vaporize
juice. And if those chance events happened to coincide with a person who was using an atomizer build below 0.1 ohm, this could end up being dangerous for the parallel
batteries, assuming the slim possibility that the coil was able to stay lit for very long before burning out... along with the possibility that the user is using
batteries with a CDR lower than 20A installed (so less than 40A CDR for the two parallel batteries combined)... compounded with the possibility that the batteries did actually vent and the mod venting openings were blocked. I think there is a higher chance of a regulated mod exploding while plugged in through a built-in USB charging port.
I could also think of a specific order of things that could go wrong sequentially in order to make the revolver fire without using the trigger. That should never happen though, because you should treat your revolver with the respect a loaded weapon deserves. Always be sure the barrel and action are clear from obstructions. Carry your weapon so that you have full control of where the barrel is pointed. Don't point your weapon at anything you do not want to shoot. Be sure of the target and what is beyond it.
A mech mod isn't going to result in anyone getting killed if something goes wrong. There is a small chance that they could get hurt, though, if they have a blatant disregard for safe practices with their gear and batteries.