What do mean, could you expand on that?
Sure thing.
Example of someone doing multiple small things that would eventually lead me to want to kill said person:
At a noble ball, character X calls my character out on something and humiliates them.
The next week, X spreads a rumor about my character cheating on his wife
some time after that, X sends a fake letter to my character's lord acting as my character, insulting the lord.
finally, X hires a group to break into my character's local bank and steals only my character's money.
X gloats about each of these incidents to my character, but makes sure to do it in private where he can't be caught saying it.
Each one of these incidents taken on it's own probably isn't enough to warrant my character killing character X. However, the totality of the repeated attacks has now left my character socially shunned, divorced, probably banished or jailed, and broke. This sum would certainly mean in my mind it would be logical to kill character X.
The issue is that based on the part I quoted, because I didn't tell player of X that his actions at the beginning of the ball might eventually lead to my character killing his, I am not allowed to, despite it being logical that my character should.
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Example of the idea of killing a character long after an action happened:
Character X kills my son. it's done secretly, and made to look like an accident.
Months later, an informant in X's inner circle come and tells me what actually happened.
Despite being months ago, the news of murder is fresh to my character, and would logically want retribution on X.
However, because of the quoted section, since I did not tell player of X that his actions (that I didn't know about at the time) would lead to my character trying to kill his, I cannot then attempt killing his character.