Annihilation, high class and winning

[Jiendo]

Situation

Player A is level 8, and has the high class mod

She fights and everyone agrees she wins, fights over.

After the fight she states shes using her high ability to forgo treasure for the winning level

Player b has annihilation

Can he
A) use it on the monster or since were at the point the highs being used is it too late
B) can it be used to counter high and destroy it

Id say no to both as annihilation can only be used countery as a cards played but i wanted an official ruling