Save cancel responses and the framework Window

By Valen2, in A Game of Thrones: The Board Game

Question on how exactly this works

So my opponent is playing a greyjoy deck and has both the iron mines and the iron cliffs and one character in play.

He plays valar morghulis

we move to the framework window

In the save/cancel response phase he uses the iron cliffs to save his only character

we then more to the regular responses and i play He calls it thinking canceling the Iron Cliffs response.

Can he then use the Iron mines to save against the origional effect or because were past the save/cancel response part of the framework action is his character doomed?

Thanks for the help

wrong forum - this is the AGOT 2.0 boardgame forum