Also, if we're gonna be pedantic about the story line, they could of just said to Dany to flame that group of whitewalkers- it'd be game over then.
It's been thoroughly established that the White Walkers are not at all bothered by fire. The Children of the Forest set a fire outside the entrance to the Three-Eyed Raven's cave and the White Walkers strode straight through it. The Night King walked straight through fire just before he pinged Viserion.
Oh yeah, one other thing: *have. They could have just said to Dany...
Oh yeah, one other thing: *have. They could have just said to Dany...