I did a quick search on this. According to Wikipedia, they're made of "acrylonitrile butadiene styrene," or ABS. It also specifically mentions what happens when it's burned:
"ABS is flammable when it is exposed to high temperatures, such as a wood fire. It will melt then boil, at which point the vapors burst into intense, hot flames. Since pure ABS contains no halogens, its combustion does not typically produce any persistent organic pollutants, and the most toxic products of its combustion or pyrolysis are carbon monoxide and hydrogen cyanide."
Well we all know carbon monoxide isn't good, and I don't like the sound of hydrogen cyanide. Let's look that up, too!
"Hydrogen cyanide (HCN), sometimes called prussic acid, is an inorganic compound with the chemical formula HCN. It is a colorless, extremely poisonous liquid that boils slightly above room temperature, at 25.6 °C (78.1 °F). ... A hydrogen cyanide concentration of 300 mg/m3 in air will kill a human within 10–60 minutes. ... Hydrogen cyanide is commonly listed amongst chemical warfare agents known as blood agents. ... Hydrogen cyanide gas in air is explosive at concentrations over 5.6%. This is far above its toxicity level."
Blood agents, you say?
"A blood agent is a toxic chemical agent that affects the body by being absorbed into the blood. Blood agents are fast-acting, potentially lethal poisons that typically manifest at room temperature as volatile colorless gases with a faint odor. They are either cyanide- or arsenic-based. ... Blood agents work through inhalation or ingestion. As chemical weapons, blood agents are typically disseminated as aerosols and take effect through inhalation. Due to their volatility, they are more toxic in confined areas than in open areas."
So let's get this straight: When 14BLC burned down, it burned the lego hoard enough to cause significant damage. When the ABS in the legos burned, it created highly flammable vapors (which likely increased the intensity of said fire) and produced two known highly toxic chemicals, both airborne and one possibly liquid. Both of these chemicals are extremely dangerous in tight, confined spaces. The liquid chemical, if it makes its way to the blood stream, is also incredibly toxic.
Normally I would say that there wouldn't be a high enough concentration of these chemicals to have done Chris any real harm, but considering the sheer volume of legos he had at the time of the fire, I honestly don't know if he inhaled a bunch of poison while trying to grab things on his way out. Furthermore, I didn't see anything indicating how long the liquid chem stays potent and whether or not its residue retains its toxicity. It could very well be possible that all that black crap on his legos (which we've seen all over his hands) still has poison in it, and if it's been on his skin and migrated to his mouth (which it likely has just via touching his face), he could actually be continuing to poison himself post-fire just due to not throwing shit away.
