when you are attacking some other player, try to trade with them, when you are in trading mode or waiting for trading mode, both parties cant use the Soulshot or Spiritshot.
if u are a bladedancer or an assist character in the team, you can try to trade the archer or the fighters or the priest, therefore they cant use the soulshot so the dmg they done to your team is much less. but on the other hand, you cant use the soul shot yourself either. but it doesnt matter for you cuz u are not the fighter or the priest.

also it's very anonying for your enemies.

try it, it should work in every server.