Barwann would probably know of Allustan because he is a magic user. If Barwann is getting bored hearing about his companions martial arts training and not doing "work" then he would be trying to find another source of income, even if that means entertaining folks in an inn or tavern with his illusions. If Solomon makes it to town often, Barwann would take an interest in him, of only because he takes note not to steal from him because he is so big. If Solomon frequents inns or taverns in Diamond Lake he's probably seen Barwann perform his illusions, and Barwann thinking the above would probably try to win Solomon's friendship if only to protect himself if he was in trouble. Barwann would try and keep his distance at first from Sharlea, he doesn't know how she would react to his not-so-honest ways. If she seemed keen on giving out handouts to the poor, Barwann would probably try and convince her that he was down on his luck.