There was no impact on the progression of the Southern Ooofpa Loopa when its Northern counterpart fell in battle. Without any continuous artillery to hold it back, the Southern Ooofpa Loopa continued to approach Demopolis through the seas slowly.
The Bone Spirit Sea Demons started to seep through the defences of the Suburban area since there were as many leaks to its defences as the number of offensive opportunities to attack them. Urban warfare was not as easy as the Pandarens had initially thought it to be.
Because of the strength of the monsters, the ability to defeat multiple Pandarens with just one swipe of their tentacle arms, the Bone Spirit Sea Demons were actually overpowering the Pandarens in the fight. Their makeshift barricades were not doing much in the way of stopping the rampaging Horde, rather it provided only a moment of respite for the Pandarens to regroup until they could no longer hold the place.