Time limit on killing a contested mob

[zanderklocke]

Recently, I've run into a situation twice in South Karana. I spawn and track Quillmane for people I sell cloaks to. When I do this, I kill a few placeholders and then track. I know Quillmane is a FTE mob since it cannot be camped unless you have someone sitting on each of the three possible spawn points. However, most people are pretty courteous and leave Quillmane alone when they realize someone in zone is spawning her.

Lately, I've run into a situation in which a low level ranger in his 20s, who I will leave unnamed, basically kites Quillmane around and kills slowly, basically hitting mob, snaring, and the medding to regen health again. Basically, it turns into an almost 20 minute kill process for this guy, which is about the amount of time it basically takes to spawn Quillmane. I'm wondering if there is a time limit on contested mobs? Can they be kited around and killed slowly over a period of 20 or more minutes?