Well, at least one of the people here wasn't yelling.
Xion really had no idea what was going on, but she both felt bad and was annoyed at the same time. The former because Namine didn't deserve this. She was just trying to help Roxas, and since Xion was worried too she'd let her come. The latter was aimed at Timon, the main source of the yelling at the person who did not deserve it.
It was very, very tempting to yell back. For now, though, she bit her lip to stop her from saying something that would make it worse and stayed next to Namine.
my tl;dr is not as tl;dr as your tl;dr ;-;
Xion really had no idea what was going on, but she both felt bad and was annoyed at the same time. The former because Namine didn't deserve this. She was just trying to help Roxas, and since Xion was worried too she'd let her come. The latter was aimed at Timon, the main source of the yelling at the person who did not deserve it.
It was very, very tempting to yell back. For now, though, she bit her lip to stop her from saying something that would make it worse and stayed next to Namine.