Boss Arena Objectives

So, if someone could explain to me exactly what's expected when you play, I'd really appreciate it.

I played a couple of rounds and each time offered me another unanswered question. Are you expected to actually kill the boss?

Part of me feels like it's unfortunately very unbalanced, since the boss retains what I assume is their regular game HP. Or is it because I'm underleveled (lv. 111 beast tamer) and don't have crazy DPS to down it? Though that wouldn't make sense either because it's from level 60+ ....
So is the point just to stay alive as much as you can and avoid your opponent? That doesn't seem very fun.

The only reason I've won the past couple of times is because either I killed my opponent more times than I was killed, or my opponent wasn't able to kill me at all.

Obviously when you're the boss it's pretty self-explanatory. Kill the player. So no question there.

whoever dies the least wins

whoever dies the least wins

Not true. Yesterday I faced a Kanna who kept healing herself and binding me, only allowing me to kill her twice. When she was the boss, she managed to kill me 8 times.

I think remaining HP has something to do with it. I had all my HP left (she didn't do any damage) when I was the boss, but I managed to get her down to 40% when she was controlling the boss. I ended up winning.

I can barely take out a smidgen of HP on any boss

From update notes:

The player that is able to kill the boss with the most amount of lives left, wins. If both players manage to kill the boss in the same amount of lives or both lose all 15 lives without killing the boss, then the winner is the player with the lowest level. If you are the same level, then it's a draw!

In the case of both people failing to kill the boss and not running out of lives, I'd assume that whoever dies the least wins.

Oh well that's annoying. It goes by level. Makes sense, but oh how much simpler it would be if they arranged the matchmaking by level.

nevermind i make no sense and can't read