Simple... Supress the Hammer.
Defenders with Suppression Grenades and Nightstalker Tethers are the single most useful abilities in PvP at the moment because they can shut down Stormcallers and Hammers.
You have to choose whether to be Agressive, or Reactive. In my experience, the players that react the best tend to win.
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There's the issue of titan skating past the suppress but I hear you dude