T4 is extremely laggy with guilds like SOUL and BP running rise/no escape on mesmers, and lich minions. They pop those minions the servers cant sustain and nothing works.
edit: one example, we were desperate to counter them so we had our 2 reapers attempt to run RISE back but it didn't seem to effect them as hard as it did us. Eventually skills just don't work. At this point we just walk away from certain groups now, this game is 10 years old, its easier to just deny people content then feed into anet's broke systems.
Edit # 2, Another example of the lag