Fast rolls are your best friend in PvP. Often times, I dodge twice when my opponent swings his weapon once because of the potential lag hit. That's about all I can say in that regards. If you're reffering to Great Scythe's dead angles through shields or the newer 'Ravioli Step' that really throw people off guard, again, dodging constantly is your best bet. It's all about finding that moment. Then again, I've gotten my arse handed to me a couple times by the more dedicated vets so what do I know?
Liquid Nitrogen is dangerous because it can freeze anything in seconds, which begs the question... Will it blend?