Uhh, sorry I lost here a bit. If things like Blizzard or Tsunami triggering the 20% redux from Viper, it will not apply for the followed up pet attack? Or it only works if Blizz/Tsunami is bound to my weapon attcks? Or will it work if I bind Tsunami to Wind Devil? Sorry I did only mentioned the familiar Storm Orb before.
**Edit: Nvm, I tested it on a dummy, so I found that Familiar/Blizz will not trigger the Viper, but Wind Devil/Tsun/Blizz will. DEE with BloodBurst also looks like will trigger it.