The skills of the second boss were not a cause for concern. Moreover, after the boss had been weakened, it was arguably weaker than the first boss. Even so, if an average party went up against this boss, the skill of the boss which summoned hounds would still be able to cause some chaos.
On Jiang Fei's side, however, only was Isabella attacking the boss other than him. There were also no Healers, so nobody else would generate the aggro of the monsters. Even if Jiang Fei did not do anything, the hounds' first target would be him. After the monsters attacked Jiang Fei, their damage would be reflected back to them by the Eye for an Eye effect, which would further stabilize the aggro!
Lava Demon Hound (Demon, Advanced Elite)
Level: 36
Health Points: 66,000
Attack Power: 3,200
Skills: Fiery Aura!
Remarks: Lava Demon Hounds will not die before their owner dies!