I'm with FreelanceWizard on this for the most part. If I'm RPing outside of party chat (which is 99% of the time), then it means we want to be heard. However, I will apply a slight caveat to this in that roleplayers wanting to poke into a scene should be aware of the setting currently being RPed. For example, in TERA there is a hall of rooms in one of the main cities (Velika) that a bunch of us have adopted as the go-to location for a friend's character's medical clinic. When we're roleplaying there, we're pretending to be inside a multi-room building; however to an outside observer, it just looks like we're roleplaying out in the open. It's not like we have much choice - there aren't a lot of places in the world where we can pretend to have a clinic. When someone approaches us, we gently and politely let them know where the front door to the clinic is; usually they oblige. But basically the lesson here is to be aware when you want to push into a scene - the RPers you're watching may not be exactly matching the location to the scene they're acting out.
"Song dogs barking at the break of dawn, lightning pushes the edges of a thunderstorm; and these streets, quiet as a sleeping army, send their battered dreams to heaven."
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