Lara's uncle didn't know why he listened to his words or let him do it. The final formula was delivered to William, and with a single glance he knew how revolutionary it was!
William was aware of the explosive substances, the ones that could be inhaled and enter the target's body, ending up exploding everything within. But he never heard of a formula that could mix the berserk effect of his toxin with the explosive nature of this substance.
The mixture seemed out of this world, and indeed it was. William wanted nothing more but to find that master and have a long talk with him.
In his eyes, this master was someone who came from the outer world just like him. Or else such a thing that didn't even exist in the outer world wouldn't be present here.