He may have not done that hoping the lack of communication would have solved that... >.>

Though Fergus may have planned for that, his last two New Bloods are busy setting up the nuke.... 

Fergus was also turned to dust, well vapor more or less. Hank being only a few feet away from him when that happened. But who knows! Maybe Fergus acted as a meat shield and Hank's alive! Or got turned too vapor as well, still deciding.