you may have been experiencing lag, but you missed the shot rather badly. only a few of the pellets would have hit. not enough to kill him. i paused it a the 9 second mark and you can clearly see your shot going to the upper left of his head.
i am in no way saying lag doesn't exist, cause its more rampant now, with a smaller player base, but that was more you missing than lag.
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So there were 3 Titans there, I was standing right in front of the doorway, a teammate by the steps, and another nearby. I shot first (critical marker pops up), the other titan shot too, and my 3rd teammate was there too trying to melee. That Warlock magically walked by all 3 of us while I was blocking the doorway, appeared above us and nova bombed backwards to take all 3 out. No it's not lag at all :P . . . PvP settings working as intended!
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there wasn't any hit markers. i watched the vid 3 times. no hit markers for your shotgun shot. titans have the shortest melee range of all classes. you just weren't close enough. from your video there wasn't any noticeable lag. if anyone else has any video of that encounter post it. it may support your claim better. but from your vid, you got out played.