Guild Wars 2

I have tried for this Achievement twice at different times and I watch my combat log while I am Running around avoiding the supposed only place the cannon is showing it will fire but I get hit by a phantom Shot

These are my two screen. both are Prime Light beams didn not shot up on the Ground and just randomly hit me

I’ve given up on that one cause I’m just tired of the phantom hits. Not sure if it’s lagging related and my screen doesn’t show everything. for these events I put my setting slow so that I can move around fast, but it still doesn’t help to see where these random hits are coming from.