Can not enslave Dulusak

I have been able to enslave Dulusak in the past, but in my last 10 tries, it has been unsuccessful. Was something changed in regards to this? Here are two of the logs wilderness < 1350/1350(100%)hp 63/522 (12%)m 1075/1178 (91%)mv 34666tnl (-96.97%) 2 AM> enslave dulu You attempt to cower Dulusak into submission, but fail! You yell 'Help! I am being attacked by Dulusak!' You parry Dulusak's beating. wilderness < 1224/1224(100%)hp 142/522 (27%)m 1048/1178 (88%)mv 34666tnl (-96.97%) 1 PM> enslave dulu You attempt to cower Dulusak into submission, but fail! You yell 'Help! I am being attacked by Dulusak!' You parry Dulusak's beating.