Did Pakistan use any artificial means to make the ball reverse swing in the game against NZ?

[Sartaj]

It never happened in the history of T20s as daniel vettori said.
how could umer gul reverse swing the ball in the 13th over itself?

 

[Skater]

Because Gul is a very good bowler. Pakistan won fair and square.

 

[Pranav]

I don't find any reason to why it can't be discussed here :

http://www.planetcricket.org/forums...aniel-vettori-hints-ball-tampering-54983.html