S ranks needs invulnerability

[Kaecilius]

All I think of is "where is the line stop?".

At 5 minutes :P

No, it usually depends on World/Data Center culture. In Primal we usually actually wait 5 minutes as a courtesy to fellow players, but it only takes one troll or player that doesn't know hunting etiquette and it's all over (with a lot of people shouting asking everyone to do slow DPS). It's particularly bad right now since we get an influx of players that are not normally part of the community. And mind you, early pullers are usually not the spawners themselves.

The problem with the world changing feature is that since everyone jumps in to try to get to the mark at the same time.. You basically get this situation: