I once had a player that wanted a Decanter of Endless Water just to waterboard people 😳
I think the screams would be muffled but still audible. Until the bag is closed, the extradimensional space inside is connected to the outside world. However, since sound can only escape from the opening and not the sides of the bag, I would rule that it is much quieter, granting disadvantage on checks to hear the scream.
It’s up to the DM if it comes across like a portal to enter the bag or an impossible space like the TARDIS. Air does not flow between as you can suffocate and air would carry the sound, but I always rule it as feeling more like in impossibly large space rather than a magical portal.
Idk, that feels a bit too technical. Trying to apply real world physics to D&D breaks way more things than just this, so we gotta be careful when to do it. Gotta keep just enough believability and consistency, without letting it ruin the feel.
For me, the fact that “starwars lasers go pew pew” is enough reason to disregard how sound actually works in real life, lol.
You could just kill the guard by leaving them in the bag
I would immediately shift your alignment to chaotic evil for it because you’re literally making them suffocate to death over a period of about ten minutes, but it’s still RAW.
Except if the guard manages to rip a hole in the bag from the inside, they can destroy the bag and everything inside it will get scattered across the Astral Plane. Pretty bad for the guard, but better than a slow death being suffocated. Plus you don’t need to eat or breathe on the Astral, so they could live there indefinitely.
Tearing the bag from the inside seems like an easier said than done proposition.
Not if they have a blade. Sticking anything sharp inside the bag tears it.
Also, I would much rather suffocate over 10 minutes(which would suck horribly) than live out the rest of my natural life floating alone in the astral plane.
And that’s only if they recognize what’s going on. If you’re just minding your business and suddenly it’s dark and hard to breathe, there are a bunch of monsters, spells, and magical phenomena that are possible culprits.
I’m still going to wildly swing my scimitar in the dark