Supposedly Miriam (the friend who performed the maneuver) said she had no idea what she was doing until it was done. Also, I'm not sure why she even asked Allyson (who was choking) if she was choking, because she apparently had her hands around her neck, which to me, is a visual sign to others that you are choking.
2007 - Majesty of the Seas (Bahamas)
2009 - Enchantment of the Seas (Western Caribbean)
2010 - Freedom of the Seas (Western Caribbean)
2013 - Golden Princess (Alaska, roundtrip from Seattle)