Ok, now the explanation, and plea for help... And even you guys who don't play Aion could probably offer advice too!
Training Grounds is an area where up to 6 people can go from levels 25-28. Great experience, great drops, and great teamwork and fun.
Rik and I created toons to get to level 25, so we could help Gwyn her first few times in there. Its a blast when you are in with people you know. Ric has a sorceror, Gwyn a ranger, and I created a templar because that's the only type I never created.
A templar is a warrior type, that can be pounded on and take little damage. However, a temp doesn't do a whole lot of damage when they do hit. They have skills that taunt, and make the baddie turn their attention to you, and away from your group mates. They use either a sword and shield, or just a huge sword. I like the shield skills (especially when you can bash with a shield) so that is how I am equipped.
Ok, our first night in, we had 2 temps. I didn't know what my role was... My group was saying let temp #1 go for the first baddie (along with the other players) and I should got for #2. It was ok, but very confusing because we kept switching back and forth and to be honest, I didn't know what I was doing

Ah, I know you all remember how I am!
To make matters even more muddled, we had Rik, a sorc, who can freeze the leftover baddies in place. So there's really no need for a second temp to start hitting on the second target.
Ok, last night it got worse. I didn't really want to have 2 temps because I was so confused the first night, but it's tough to get a group, so there we are with 2 temps. Same thing again, they told me to off-tank, which made no sense to me since we had Rik the rocking sorc, but ok.
We were in the middle of a rather bad pull when the cleric says something like, "Ok, I am not going to heal you if you insist on off-tanking when it is totally un-necessary." And she stopped healing me. I had to run. It was mean, and nasty, and the only reason I stayed was because of our legion mates. (Once you leave TG, you can't go in for a day) I said something like "I guess I am not allowed to learn how to play this game and make mistakes?" Something like that, maybe a bit nastier. Then sulked for a bit, but finished up by following the so-called rules.
To end my story, she and I discussed the whole thing at the end. I think the guys in the game got worried, because as we started, both said "Ok time to go..." but they stuck around and saw that we handled it all well. She and I even became friends at the end. She told me that she started the run in a bad mood and I told her I was grumpy from not having my nap.

So, explain, if you can, these things... enmity, aggro, taunt. I understand the basics, but there are subtleties that i am clearly not getting.
Zora, I wish you were there...
Sable Wood - Ashyn - Hollye - Roze - Valerie - Aloe - Fern - Monah - Autumne - Sedar - Celeste - Marissa - Noe Badi