Van sat down, ordered a drink, and pondered the thought for a while. Parasitic mind-controlling brain slugs, eh? That's... certainly the kind of invader that can really drive your paranoia up a wall.
It's probably not like Thyllian bodily possession, which is obvious, awkward, and temporary. It's one of those things Humans feared in all their alien invasion fantasies: body snatchers, extraterrestrial hypnotics. It isn't beyond belief that such a race exists, but how would they have gotten off their home world? Maybe a native species there was sufficiently appropriate? But, if that was the case, why invade?
The Pirate took another swig of his drink, and looked around again. Ogreon was trying to make himself known here. His appearance wasn't something one would consider "friendly" from the start, so his efforts were understandable. But, he was also loud, and a bit overeager in his demeanor. Poor guy can't get a break, Van mused with a shrug.
The Clangst eventually returned to his side, perhaps the Bar was a bit too much of a mixed bag for him? Van wasn't sure, and though he wanted to ask more about the Yeerks, he also wanted to help the Ambassador.
"Hey, looks like things haven't gone too smooth for you, eh? You've got the personality, you're nice enough, but mm, the chaa..." he stumbled over the word, and paused, "Chaa-risma. That thing the word, whatever the word is. The people magnet. You need to find yours, the magnet. Mm, chaasi?"
Van grinned, and pointed at Ogreon, as if to make the point.