A panic spread as the man started

[Bassim]

I am wondering if my sentences are grammatically correct. I am not sure if "it was shown that..." is the phrase I should use, but I couldn't remember any better phrase.

A panic spread as the man started screaming and brandishing a machete in the supermarket. When he was tasered and arrested, it was shown that the machete was actually a cheap plastic replica.

 

[andrewg927]

I think it's fine.

 

[GoesStation]

It would be discovered, not shown.

 

[emsr2d2]

I'd remove the indefinite article at the beginning and start with "Panic spread ...".