Calling out a high priority target or discussing battle tactics is NOT a griefing, nor is it a violation.
It is 100% important in a TEAM based game to communicate what targets are big threats.
Recently people are using the tier "grief" or "griefing" in a fashion that it does not fit.
If you simply said something like you say you did, you are fine and that is not a violation at all.
Furthermore, using game mechanics or things that are in the game in a fashion to work towards victory is also NOT griefing, contrary to what some people say today.
Just shrug it off and keep playing, you were being smart with your call out!
Now, that being said, if you turn the conversation to personal attacks... this changes things some.
Mahalo,
-Hapa