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Hobbyists should buy cells with pre-welded tabs. You solder onto the tabs, not the cell terminals.

It doesn't quite explode. Instead it shoots out a super hot flame that is nearly impossible to put out.

Imagine having a blowtouch that you can't extinguish or touch which is likely rolling around.

That sounds exactly like one of the kinds of deflagration (aka low-speed explosion) that seems worthwhile to discourage people from invoking.

"Hey, the worst case is that you get jets of super-hot flames that are impossible to extinguish!"

Don't solder lithium cells, even if it goes well you'll ruin them. You need a spot welder.