*waves hello*
One thing I thought I'd bring up is Lalli's spellcasting. He goes from very terse short statements to beautiful, lyrical chants. Some of it may be rote teaching, but from the translation threads, it's shown that his spell to the moon was crafted taking into account that he's far from his home grounds and exactly what he wants the moonlight for.
His second spell starts with an eloquent plea for clear radio air and when he doesn't get it, he adds in a threat and finally delivers a big spiritual whack strong enough that the people outside noticed.
So it's possible that some of his communication problems with people stem from the fact that he has so little day to day contact with others that most of his speech patterns are rooted in his spells. And if Onni was his tutor in spellcasting, then he probably only spent short lessons getting the necessary basics down, since Lalli is a scout and Onni won't step foot out of the gates. So it's easier for him to point out that this place 'felt wierd' to a non-mage like Tuuri than for him to give an accurate discription of what he sensed that takes 4 stanzas worth of words only for her to not grasp anything other than 'it was wierd' because she's not a mage. Not to mention speaking about a bad place that accurately may have nasty consquences. Spirits *hear* Lalli when he's chanting.
So, since Lalli is so poorly socialized, and he's a mage/scout for whom very precise language is a must, he falls back on short, terse statements or maningful glares and firm finger pointing to get his message across to people who even if they speak his language, have no idea what he's trying to say.