In Carrion Fields, roleplay means that you behave like your character would while playing in the game, without going OOC. Roleplay of a hostile character would involve chopping you into pieces without an advance warning, just like an enemy soldier would kill you in a war. While what you see in this situation might not differ from what you get from a PKer with no roleplay, the attacker is probably acting according to his own roleplay when attacking you.

Playerkilling in CF is driven by roleplay and characters are expected to have a reason to attack someone. However, they are not required to communicate this reason to the victim. Due to the fact that hostile characters attack/avoid each other on sight, it is rarely possible for them to sit down in a same room and communicate with emotes and says. However, CF has a tell command that allows you to speak to any character online, not depending on their location. Interaction between hostile characters is handled mainly by on tells.

As for emoting, most people do use both emotes and premade socials as part of their roleplay. CF can be fairly fast-paced at times, but there can be calmer moments which allow the use of longer emotes. In places of relative safety such as the Inn of Eternal Star, it is possible to have a slower-paced emote interaction, but most people in CF are not used to waiting a few minutes for your emote, so it would be generally wise to adapt to that. So rather than long emotes that take few minutes to write and think up, it would be advisable to use medium ones with a quicker response than those few minutes or break your long emote down into shorter parts if it can be done.

As for creating your own stories via roleplaying and sharing them with others, that can be done in CF as long as you remember that you can't make others to act according to a prewritten script and that you shouldn't script up in advance things your PKing abilities can't back up.

Anyway, welcome to CF!