When they arrived (with Casey knocked out after his fight with Tiger Claw, who threw him off a building), Karai secretly uses a tracking device to have Tiger Claw locate where the Turtles are.
Karai secretly uses a tracking device to have Tiger Claw locate where the Turtles are. They arrived (with Casey). This Casey was knocked out after his fight with Tiger Claw. Tiger Claw threw him off a building.