First, I'd like to apologize if this has been posted before, but I didn't see it. Secondly, this is very much common sense but not many people really think about it, including myself. Credit goes to the Horde I saw today who did it. But we were in Kun-Lai, and I had this Horde targeted. I didn't plan on attacking him, but I guess sitting literally on top of him got him paranoid xD He then /pointed to a pet who was named Icomeinpeace. I thought that was clever and never thought of doing that.
So, plain and simple.
1. Find someone of opposite faction.
2. Rename pet to short phrases to communicate.
3. /Point at your pet. (*Name* points at Dontattackme, something like that)
4. You're talking to the opposite faction
Yes, you can just add them to battle tag, but some people don't like to have a list of twenty thousand people.