Why are none of the Dragons attacking the Night King in S07E06
I wonder why none of Daenerys's dragons are attacking the Night King during the rescue operation in S07E06 of Game of Thrones. The group just found out that killing a White Walker also destroys the un-dead associated with him, so it seems to be very promising to attack the Night King. He doesn't seem to be protected by anything.
Maybe he can cast some magic spell, but with the knowledge of the characters it makes very little sense not to try.
Because they didn't have time
Dany and her dragons arrive just as the wights have started to attack Jon and co who are getting quickly overrun. The plan is then to keep them safe, as it is a rescue mission, and keep the wights away from them.
The Dany and Drogon land to save the group whilst Viserion and Rhaegal are still keeping the wights off of them. At this point the Night King takes gold and spears Vicerion under the wing. The plan is then to fly away as quickly as possible before there are any other casualties.
But killing the White Walkers kills the wights?
True from what we are led to believe this is the case. However, neither Dany nor her dragons actually know this. The Merry Men have only assumed it is the case from when they attacked the scouting party and in the chaos of the rescue mission no one really had time to tell Dany.
You can watch the scene here: