1- The two dudes in Flotsam that approach Geralt with an offer to test their 'stuff'. They're alchemists and they mention a lab in Vizima. They hang around Einar's bookstore and usually after Geralt accepts the offer they park themsleves inside the store.

Is there anyrhing to pursue here or it's just a reference i'm mising ?

2-The dude outside Henselt's camp turning rocks.

Same question, what am i missing here ?

Thanks.

Edit: Damn, i forgot to mark this as a question, go to this thread instead.