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I was playing lee sin today, and whilst in combat I died with my GA.
I was clicking really fast even just before I died and bypassed the animation which stops you attacking while reviving. And so I was able to attack the enemy while invincible for about 3 seconds, and was able to kill them.
This is rather major, and can turn the tables in games, I believe it occurred because I made a command to attack in a split second before I died, and when the GA activates meaning that it was overwritten.