Go for it. After thinking for a week on how I want to end an encounter I went with a small knowledge dump. Stories are great ways to get random supplemental information anyways. It's the readers problem if they are too stupid and get obsessed over it anyway.
In my case, with magic being prevalent in the world, I hammer in how magic doesn't make them all knowing. Advance in some aspects. Retarded as fuck in others. Using vaporized aluminum to crystallize in a groups lungs. Guaranteed dead in two days. Treat electricity like magic kids! Be scared. Forever. Shit's crazy.
Just make sure it flows just like the rest of the story. Do you have to go into detail for a "speed boxing combo" or does the common knowledge of a "one two" punch portray the same? Does the copoeira technique make sense before and after the fight? I mean is it something random that is added in or something that will remain as a supporting structure for the characters background?
Back to electricity being an eldritch abomination (I hate my elec. class with how I'm diving into this forbidden knowledge).
- It fortifies how my MC despite being aloof can become a monster if pushed too far.
- Shows strongly one of the tenents on why the MC doesn't want to get involved into things.
- Fortifies the belief of the MC that someone from Earth has small useless knowledge that can be devistating if used at all
- It gives lore for world.
- By comparing how magic still limits thought.
- With how air magic (the delivery of the alum) doesn't mean they know how air currents work.
- Poison being a grey area in how it is perceived and calculated by the worlds litrpg system
- Earth magic while knowing that aluminum exists (do to it being one of the most prevalent metals), doesn't mean they know how to use it beyond jewlery/draughts (like gold or mercury in ancient Earth)
- May or may not strike fear into the reader in showing how they can die from something they didn't know before I point it out for them
- Is portrayed as a string of facts with cutting back to a more animated indoors party compared to thoughts of the MC. Showing the contrast of the jovial mood with the coldness of the psychopath that is killing them without them knowing
Just like this post! You might forget what I've said but kept a lingering background of "eletricity is bullshit" with a small caveat on aluminum. Reinforced with this bit of random knowledge:
Go to a hospital immediately when you get shocked. Something might have started moving the wrong way, outright burst or cooked inside you.