Pathing Splitpaw Trains From Across the Zone?

[Jaauta]

I was killing in Splitpaw on my paladin when a strange thing happened. I had just pulled a gnoll from through the first set of double doors. I got him to about 50% (fought for 20 seconds or so) when a massive train came running through the double doors. The train had all kinds of enchanter and mage gnolls from deeper in the dungeon. I sent a tell to a guy in the zone after I died and he told me you just can't go past the set of double doors; you have to basically just kill at the entrance because mobs will train you through walls, floors, etc.

tl;dr - I was killing in Splitpaw and a huge train aggroed me at the entrance. Got decimated by like 100 gnolls.