Emily (Mutated)

Chapter: 8 · Water Treatment Plant
Where: Water Treatment Plant: the Storage Bay, seen from the door.

Weak point

None: no phases and no weak points.

After the power is back, Emily bleeds out in the Storage Bay. Grace tries CPR and Emily mutates; control switches to Leon at the door. It's a scripted, mandatory moment: shoot her until the cutscene triggers. Her movement is erratic but not fast.

Reward

None. Afterwards Grace leaves with Victor and Zeno, and the A Harsh Reality trophy pops (escape the care center, 200 CP).

No published HP. No documented difference between difficulties.

Step by step

Keep shooting with the Alligator Snapper until the cutscene. The pistol is enough on any difficulty: save your shells and rifle rounds.
It can't be avoided: even if you don't shoot, Leon fires at the end.
No consequence: in the Release Elpis ending Leon says he didn't aim for her vitals, and Emily is rescued and cured.