Raid Boss Premium Ball. Damahe

If I recall correctly:
3 balls-20% of the Raid boss HP
2 balls-10% of the Raid boss HP
1 ball-5% of the Raid boss HP

It resets if you rejoin the battle after 6 mon are knocked out, but not if you stay in the lobby and not go back in (should really change tbh, leeching is really disgusting behaviour)

However, you can quit and go back in and still hit 20% for the 3 damage balls, provided that you have hit that 20% with the latest 6 mon that you have entered with.

Mathematically you can get the 3 ball damage even with a group of 12 (you only need to hit 20% of the damage and hope other people come in with Blisseys or other rubbish)

However, if a boss needs >5 people to defeat, then it's impossible to get a 3 ball bonus (Lugia definitely, maybe Articuno).

It stupidly resets when you rejoin a raid. If you are not going to make it with just six pokemon, you should back out after your first two-three best counters, heal, reselect, and rejoin so you have have time to build back your contribution.

FunkySho just posted a video where he had 2 trainers and one didn't fight till boss was already at 20% health. Then both trainers fought to clear it and did about the same damage and BOTH got +3 balls.

This sorta confirms that it's actually a percentage of the total damage of EVERY raiders LAST team vs the total boss' HP. Meaning that the boss HP is irrelevant.

You just add up everyone's damage, see if your team is 20% of that and get +3. If no one else faints in a large raid, it'll be impossible to get to +3 (say if there are 10 trainers for a Lugia raid and everyone does about 10% damage and no one has to rejoin).

https://www.youtube.com/watch?v=Se9kRtyT8cU

I just did an Articuno raid. I forgot about Golem getting pasted, so I died out early on. I came back in, and most everyone died out and didn't come back in. I think I was the only one finishing it off, and I got a +0 damage bonus at the end. It figures. Nice bug! (But I was the only yellow. All the others were red.)

They should add bonus ball about our dps damage contribution defeating the boss.
I've already tried agains Lugia. Using all blissey and the other using all Tyra and Gyara
The result, using blissey I had bonus ball +2. Which when I used Tyra, I make damage to that lugia much more.
Why they didnt consider about this?

I suppose a benefit of this sytem that we have is there is now some STRATEGY to make a team that can last the whole fight...Say, if Niantic didn't let you rejoin the battle, this would force people to balance DPS vs. at least 1 mon left standing.

On one end of the spectrum, you have 6 Blisseys and won't win...On the other is 6 Glass canons who can do max DPS, but will all die and you need to rejoin. If you can't rejoin, now you start mixing it up and have to bring "other" defenders into your lineup to get a good mix/balance...This would make Mons like Lugia, Snorlax, etc...useful. Still no use for low CP prestigers still, but a bit more.

In a way, maybe a no rejoin situation is better, then people will need to use "more" mons which is a benefit to the game.

Of course, this no rejoin would wreck any low trainers hard and they would get nothing (or, they can make it if you get knocked out, you get +0 balls)...

(Ok, sorry, I suppose I am trying to make the game harder/more complex/strategic...).