I don't know that you were seeing lag all of the time there.
The shields on your opponents were dropping and another player seemed to have no trouble with taking out that warlock on "A" point. Speaking from experience (I'm a less than mediocre PvP player and I have three other people hammering my bandwidth at the house), sometimes it isn't lag on the part of the other player.
It could be your own connection - or it could be that you simply didn't hit the target as often as you thought you did.
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100/10mbs fibre connection on cable. But yeah it's totally my fault.