Do not rush the objective when there is a deadzone placed. This means playing passively and prioritising targets on the enemy team while waiting for the deadzone to disappear. Once it's gone, the team can group up and start to slowly cap the point.
When is dealing with someone else use poison arrows and then keep shooting (dont forget legendary card fot poison damage boost). Now thats a definite kill.
Deadzone is not completely ground-based like Damba's gourd or Tyra's fire. It works like Viktor's ult which means that it can be blocked with shields as long as you're not exposed to the middle.
Viktor is not CC immune during Barrage! If you so happen to be close to an enemy Viktor using his ultimate, Runic Blast will prevent him from attacking for a few seconds, allowing you and your teammates to save themselves and/or kill the Viktor.
Push her clones away from point to minimize healing. Push her clones from map edges - guess what happens if she uses her "Dimension link" teleport. Usually Ying jumping between clones to confuse enemies, not paying attention to location of the clone