Since butane has very low head pressure at room temperature (10-15 psi), I wonder how they had a failure of that size? Storage tanks for butane are rated at 250 psi.
Unfortunately, butane is delivered without mercaptain odorizer, so leaks in plumbing are easy to miss. Maybe their process was running unattended? Obviously they had no carbon detectors in the building, which will result in huge fines.
(Propane and butane bulk transport Is my business...)
Wasnt it your wife that got burned? How is she doing? The video of those firefighters trying to escape his horrendous.
They truly are brave.