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Nobody would even blink if a rural home had a 500 gallon horizontal propane tank, and that represents 20x the energy content of a 1MWh battery pack.

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Relevant video from USCSB, from a propane explosion in 2007 that killed four people.

https://youtu.be/JzdnUZReoLM?feature=shared

It would make me nervous, although that's only due to my engineering background.

In any case, it all depends on what you want to stand next to. A large explosion, or a multi-day metal fire releasing clouds of hydrogen flouride.

If the metal fire is over multiple days, you can walk away from it. The large explosion can kill you before you know there's a problem.

True enough, but I'd want to be a lot further away from a lithium fire than from a propane explosion.

I think there's kind of a local minimum where you need to be farther from the propane explosion, but after your outside the blast radius you're fine, but less so for the lithium fire

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