Body aggro is not FTE?

[t0lkien]

Tonight in OOT on the Seafury island a pet class pulled a fury off me that had popped on me and aggroed, saying I hadn't damaged it and so it was up for grabs. I charm kite two mobs there at a time, keeping one as my pet (pet was almost dead so the aggroed mob was a free pull basically). I have to body pull the mob that isn't used as a pet so it aggroes my pet and not me - it's how aggro works, and is particularly sensitive on p99. If I damage the other mob in any way, it's almost impossible to charm kite it.

So, my question is, is that the way First To Engage (FTE) rules work on p99? Now the guy was just being a dick, but the point needs clarification. Does body aggro not qualify as aggro?

For the record (and I'm on Seafury Island almost every night lately) there are a lot of players who compete for seafuries, and it's understood I and other classes could pull the entire island and handle it easily if we wanted to. We don't do that, we share most of the time. I can say I'm always considerate of other players and have forgone mobs I could have taken because I know the other player has been looking for a while etc. So for me it's a matter of principle, not greed. The mob is irrelevant. The point is important (and also, I hate assholes in any form - in or out of game).