Mother Miranda weakness

[icon_of_sin]

Mother miranda takes a lot of bullets.

Yet sometimes during the fight she clearly reacted very badly to getting shot.
I had clearly done something right,

what exactly causes this?

[Ice]

Shoot her face with Magnium and maxed out sniper rifle.

[Obsidian Dragoon]

More than likely you were seeing her stagger.

Every enemy can be "staggered", where sufficient damage will force them into a "recoil" animation where whatever they were doing is interrupted.

The threshold obviously varies depending on the enemy (Smaller lycans will be staggered way more easily than Urias) and the difficulty level (on VoS, you can't even shove back enemies because their stagger threshold is so much higher). And it's an important tactic for some bosses on higher difficulties (like Heisenberg).