He's claimed vig with limited selection that, in some form, expands as the game goes on. I don't see what's weird about how he's used it, especially considering that not using a vig n1 isn't even abnormal, especially so when you can't choose a preferred target.
Although I guess you didn't actually say it's weird. It seems sort of implied though by the demand. If Zak thinks he shouldn't explain how he gets more targets I don't care because it could affect him getting targets. He'd know best though, seeing as he's the one who actually knows how it works.
Also if anyone suggests lynching Zak today in a serious manner uh no. You don't lynch claimed one-shot vigs before they get a chance to use it, unless you have a really good reason to believe they're lying.