There's no reason why Alice couldn't be working in a room with a conducting floor and special conducting shoes. This is the norm in most medium or large scale workshops dealing with bare PCBs. The PHB would naturally not have been issued a pair of conducting shoes, and (given his track record) probably walked past the warning signs, adhesive conducting strips and continuity meters on his way into the shop.
I know that Alice wearing an ESD wrist strap wouldn't keep the PHB from zapping the board, but there's no guarantee that she hasn't already zapped the board herself before the PHB touched it. You don't have to see or even feel a spark for it to ruin the board. The worse part of it is that the damage could be latent. It will work at first, but fail down the road.