Ienzo tipped his head to the side. "Well, I know that you, Namine, have never been to a large party where you don't know everyone and I assume the same is true of Xion. One of the dangers is that people will add alcohol to drinks - either to a communal bowl or to your own individual drink. If you do not know what alcohol tastes like, you won't necessarily recognize the flavor and therefore can inadvertently become drunk. Being drunk impairs judgment and sometimes motor skills; without friends to look out for you leaves you vulnerable." Namine at least would recognize the need to not be vulnerable in an unknown crowd. For that matter, given the company they had kept at Castle Oblivion, she was likely painfully aware of the need to not be vulnerable with a known quantity.