[ubernostrum]

Somebody who is in your building, is doing work under your direction, and has not been told they are fired hasn't been fired.

They might be, or might not be. Constructive dismissal is a thing.

[pbhjpbhj]

No, being fired is when a person with authority tells you you're dismissed; it's an active and explicit form of dismissal.

Constructive dismissal is dismissal, for all intents and purposes, without being fired.

[ubernostrum]

Constructive dismissal is treated as "you quit, but you quit because the conditions imposed on you were such that you had no choice, and we will treat that as the company firing you rather than you voluntarily choosing to quit".