The lurker

You go look for some drug dealers back out on the surface, but find you are out of luck. You then hear a thick Spanish accent saying "What do you mean, Brochaco?", and then another voice " I am sorry boss, I thought we could take him." "Well you thought wrong amigo, he is the friggin lurker. If needed I will put a bullet in his head myself, amigo." You hate threats you grab a knife and throw it at the mexicans head, but he walks just out of the way. What do you do next?