Was in a group just now looking forward to the 3 puzzle area chests loot plus chance of any normal chest spawns, when we were all pulled to final boss within about 5 secs of arriving at the first puzzle area...
Someone had somehow avoided the 3 puzzle areas and got straight to final boss selfishly depriving the rest of the group of 3+ gear drops.
I retraced steps after boss but can't work out how they did it - is this some sort of exploit or am I missing something ? !