The Light versus Light gambit triumph is almost impossible, especially now with the heavy ammo changes and everyone saving supers and invading with ghallahorn. Also I just had a match where a titan bubble was placed on the bank by and invader and I killed said invader as he left his bubble, his bubble still active should've counted but didn't. Is this a bug?
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For this, the opposing Guardian must have an active super, placed supers like Bubble, Well or Stasis Hunter do not count as far as I know