You were in an underground facility of S-23, there was infection going around and you were lucky that you weren't infected as many did, as you were walking through the hallway you saw many infected Replikas and some Gestalts too, so you decided to hide in a room.

As you entered you looked around a bit, there was a dest with tools on it, a boxes full of parts and other stuff, But in the middle of the room you saw Elster loking at the table where the tools were and also her gun with few ammo.

She then turned around quickly with her gun in her hand

Who are you? She then looked at you closely and saw that you were not infected so she calmed down a bit

My name is Elster also knowed as unit LSTR-512, You are?