Allright, here´s a new question. Until now I've beeing playing solo. But I've met a few friends ingame and I'm about to bring some of my Brazillian friends here. So this leads to the question, while leveling in a party exp and TP are equally shared? If yes, is there some limit between char levels?
Not sure how XP/TP is shared, but as most of XP/TP comes from quests, do not worry about it, as it is just small portion of XP/TP.
Later if you like to power level your friend or your alt toon, you will have to level above L30 and your other toon or friend can't have any classes that are L30 or greater. Once that is the case, all XP/TP from kills will go to low level toon as if he killed them. (meaning you get huge amount of XP/TP)
I experienced the same with my well geared twink last night. It was L7, on scout side (R 10 / S 7) and I attacked world boss that was L12 (32K HP). At the end of fight my character leveled from L7 to L10 in an instant. (but I did not get card as drop, but only some nice low level gear

) Well, will kill it again tonight.
Hope this helps.
ps. What server are you on?