Guild Wars 2

Hello,
this is a suggestion to make WvW more competitive and reduce zerg.
Make some sort of warband, let’s say a 20 ppl group.
The warband has a tag (unique and shared between all members)
When 2 warbands start a fight every member takes a sort of “in combat with” status that makes him immune to damage from “untagged” sources, leaving it open to the 3rd server…
So 10ppl warband from server A inc a 15 ppl warband from server B … players become tagged. A second warband of 20ppl from server A arrives and start to attack server B but "immune… immune… immune… " cause they are tagged (same goes form B to A)
If a warband from server C join the fight, every warband can hit the other 2, so A can hit B and C and so on… but only 1 at a time for each server.
“in combat with” tag will remain until at least 1 player is in combat, to reset it every member of the warband has to go out of combat.

What do you think ?

Obviously numbers can be tweaked but we will no more see 100 vs 90 vs 120 lagfest fights….