You are in a battleground you see one of your team involved in a 1v1.

What is the correct thing to do. Are you supposed to ignore them, as it's a fair fight and they can win it or lose it on their own, or are you supposed to pile in, help them kill the enemy and move on.

I was watching a BG where my son was playing. I've taught him it's a team game, it's not about leaderboard position, its about being a useful team member.
So he sees one of his team fighting a hordey and piles in on the fight. They kill the alliance then he starts getting whispers from the team mate he's just helped.

Basically he said "I don't need to stroke my epeen by stealing someone elses Killing Blows as I'm in a 2200 (or so) rated Arena team and I'm more than capable of killing on my own".

It did seem ironic that someone who doesn't need to stroke his epeen felt the need to quote his arena ranking and got so upset over a killing blow.

However I am now wondering if you are meant to let 1v1's occur. I've always thought that successful BG's are pretty much where you make every fight an unfair one.
if there are 3 of them you hit them with 5, but then I have been in 1v1 fights and seen my teammates ride happily by so now I'm not so sure.