Oromeax is 16 feet tall and Zugg is 20 feet tall, so neither one can see the other over the wall when Oromeax appears.
Round 386: Zugg flies up and breathes sonic energy at Oromeax, and notices that Oromeax is surrounded with white energy. Oromeax dodges (35 Ref save) and takes 23. He has 470 hp left. Zugg then flies back down behind the wall.
Zugg:[sblock]You can breathe again in round 390. You know that Oceanus dragons are amphibious, have lightning and tranquility gas breath weapons, are immune to electricity, can detect evil at will, and have control water as a spell-like ability.[/sblock]