That host was a contested one, neither being properly possessed by Emperor and not Sel-Makor since both were attempting to gain absolute control over it. However, Sel-Makor had advantage in this struggle because of the setting of the event and nature of the host and prevented Emperor from taking full control of this host during the ongoing struggle between them, otherwise, Emperor would have dealt with Sel-Makor on his own accord. In addition, due to setting, Emperor was finding it virtually impossible to leave this host and abandon this fruitless struggle. Therefore, Emperor's Wrath II was called upon by the Emperor during this struggle to aid him in breaking free from it and when the former confronted the "contested" host, Sel-Makor had gained its control.
It is also possible that Emperor helped Emperor's Wrath II to overcome Sel-Makor.
People are wrongly perceiving this clash as a battle between Emperor and his Wrath II. It wasn't.
Last edited by S_W_LeGenD on Nov 2nd, 2014 at 06:24 AM
Nothing implies that Sel-Makor wielded Emperor's tremendous power during this confrontation. A possessed host is just an empty vessel, the possessor brings his own power in to the host while possessing it.
When Emperor possesses a host, it is labeled as Voice, and it doesn't have any power of its own; it have the power of Emperor after possession. This narrative logic is true for all possessions in Star Wars.
Nonetheless, Sel-Makor was an incredibly powerful and dangerous entity and overcoming it in single combat doesn't cheapens Wrath's accomplishments. The nature of this confrontation confuses people however as to whom he dealt with and it wasn't Emperor.
Last edited by S_W_LeGenD on Nov 2nd, 2014 at 06:40 AM
__________________ "Vader's pulse and breathing were machine-regulated, so they could not quicken; but something in his chest became more electric around his meetings with the Emperor; he could not say how. A feeling of fullness, of power, of dark and demon mastery -- of secret lusts, unrestrained passion, wild submission -- all these things were in Vader's heart as he neared his Emperor. These things and more."