Giselle Lambert was overcome with panic as she leapt to her feet to help her grandmother.

But just as she was about to touch her, the elderly woman's body began to shake uncontrollably, her expression twisting into something eerie, before she crashed backward with a heavy thud.

“Someone, help! Call an ambulance!”

The estate's medical team arrived swiftly, administering first aid as they rushed her to the hospital.

In the quiet of the hospital corridor, Giselle sat ...