Fainting?

[Bourlingueur]

Made it to the Northern Block in the Prison area... I came to a point where I saw a monster and immediately hid in the nearest cell. Then I tried getting out but another monster made its appearance and I hid back in the cell, crouching in the corner of the room where it was dark and hard for him to spot me.

As soon as I crouched my character fell through the floor and started dropping away from the map as I saw it become smaller and smaller. Then it disappeared, my character collapsed and I died.

I... guess this means I fainted while a monster is near, which means instant death? Or was it the glitch that could have killed me? Has this happened to anyone else?