Dai Li had been hiding behind the door. He opened the door slowly, deliberately letting the two black men see Santos on the ground.
As Dai Li expected, they rushed inside at once.
Surely, they didn't immediately look behind the door. Normally, when entering a room, nobody would make sure whether there wasn't a person behind the door. What's more, their eyes were looking down to Santos lying on the ground, without noticing Dai Li hiding behind the door.
Dai Li rushed out unhesitatingly and threw a combination blow to the man in the rear.
The back of the head was a quite vulnerable part. Even a great fighter who was good at resistance couldn't stand an attack to vulnerable back of the head. In some Chinese folk performances, some martial artists could smash bricks and beer bottles with their heads, but no one could perform this with the back of their head.
After the punches landed, the black man behind fell down before he even knew who attacked him.
