(Unique game aspects not part of story canon)
The "Second Tyrant" (tentative) was a model of Tyrant stored in the Arklay Laboratory alongside the T-002 model. During the Mansion Incident, it was released from its chamber and subsequently fought S.T.A.R.S. in the B4 Laboratory upon the defeat of the T-002.
Visually, its appearance is almost exactly the same as the other Tyrant. However, its torso and arm are a much darker colour than its T-002 counterpart. Since it does not stab Wesker, its claw is not covered in blood.