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Third person
A camera around a corner
Short answer
3PP lets you see what your body shouldn't. Everyone else can too.
Also: 3pp · third-person perspective
How it works
Third person is a peek tool. It is also how you get peaked.
What to do
Assume they saw you. Then clear the room anyway.
Don't
Don't call it cheating. Don't refuse 1PP as if it were a different game's fault.