A more powerful weapon

A story between two people.

A: Dont move!
B: What do you want?

A: I have a knife. Dont be rash, give me your money.
B: I have weapon also.

A: Huh? What? What are you gonna do?
B: I have flu, fever, cough... I think I might have H1N1. *cough cough*

B: Sorry, cant help it. I think you are infected.
A: Man! I should have wore my face mask... *fleee*
B: You should have known that I have a more powerful weapon, too bad for you!

This is the side effect of PW assignment!