A topic from AEG's L5R CCG Rules forum, copied for Oracle of the Void from a copy of the forum saved in October 2015, so pages it didn't save are missing. Players' names are left out; the rules officials are named. Rulings are as they stood on these dates; later rulings, the rulebooks and the Rules Archive may differ.
Let's say I have Doji Ayano in play at a battle field opposing Obsidian Dragon. She is then hit by Wounded in Battle. What is her current chi?
Obsidian Dragon's trait: Non-Unique Personalities have a Force and Chi penalty equal to their own Personal Honor while they oppose Obsidian Dragon; this will not reduce Chi below 1.
To get a stat's current value at any given time, do steps A through C, below:
A: Apply all current bonuses and penalties.
B: If the total is below 0, treat it as 0. (Does not apply to Family Honor, Honor Requirements, and stats with a + or – sign such as an Item’s Force and Chi stats.)
Note that the Obsidian Dragon's effect does not impose a minimum value on Ayano's Chi. It only limits its own effect, as noted here.
Restrictions on single effects such as “This cannot raise his Force above 3” do not impose a maximum or minimum on other effects.
So you've got Doji Ayano with -1 Chi, treated as 0 Chi, who can't die due to having 0 Chi.
After the Resolution Segment, things will be different. Unless something very strange happens, either Ayano or the Obsidian Dragon will be sent home, and the penalty she was receiving with end. She'll be at 2 Chi (4 Printed - 2 from Wounded in Battle). Then the battle will be considered to have ended and her protection from dying from 0 Chi will expire, as per the card text on Wounded in Battle. Of course, she does not have 0 Chi anymore, so she won't have to worry about that.
Now if she hadn't been a Samurai, Wounded in Battle wouldn't have protected her during the Battle, and she'd have died immediately after receiving the -2 Chi from Wounded in Battle.