If it is true that...

Humans often accidentally imitate prey to cats

and

When a human imitates prey to a cat, it triggers the cat's instinctual hunting sequence

Then it must be true that...

Humans are often the target of a cat's hunting reflexes

If it is true that...

Cats cannot easily control or veto the innate reflex to hunt

and

Humans are often the target of a cat's hunting reflexes

Then it must be true that...

There are many cases of petting a cat which appears perfectly happy, yet the cat suddenly "turns" and bites you, going far beyond any normal "play aggression" or "warning nip"