Hearing the doors move, Karis squirms under the barn wall and comes up, sword in hand. Quickly assessing the situation, she darts towards the rearmost zombie and buries her blade in its back, yanking out a putrid lump of rotting flesh with her sword.
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re posting actions out of order: It's pretty common in PbP games, to keep the speed up. Some people dislike it, since it can get pretty confusing if people have to change their actions if the conditions change by the time it gets to be their turn, but, well, you can't please everyone. It would be nice if we could all be online all the time, ready to post actions in order as soon as our turn came up, but realistically, I think posting out of order is a better compromise than just being slow. Of course, it's nerdytenor's decision, not mine, so do what he says.
Karis's actions:
Move: crawl under the wall and move behind the nearest zombie. Acrobatics check
1d20+10=15 I hope I've understood your ruling for crawling under the wall, NT.
Standard: attack with riposte strike, including CA from and sneak attack:
1d20+11=27; 3d6+8=21. The riposte, if the zombie survives and attacks Karis, is a
natural 20, for max of 1d6+4=10 damage, plus an additional
1d6=2 damage from the magic weapon. The riposte is an immediate interrupt triggered by the zombie attacking, so I'm pretty sure it gets resolved before the zombie's attack.
Minor: Look cool while doing it.

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