Game Mechanics: Initial agro

[Orruar]

Prior to the most recent patch, I could hit a kobold in solB with drowsy, and it would stick to me for the duration until it was dead (with a mid 30s rogue/monk hitting on it). This was due to a combination of the agro from slow, and the extra agro boost from being first to engage. Now, when I pull with drowsy, I lose agro almost immediately. If the rogue agros first, and then I use drowsy, the mob will stay on me for the duration of the fight like before. Likewise, if I first do something like bash or punch the mob, then use drowsy, it will stick to me like normal. So I believe that no matter what you do to agro initially, you only get the initial agro, and not the added agro from the action taken.