After killing a mob (or mobs in a specific area) you’ll still be in combat longer than it’s needed to be. I can confirm that I’ve killed a “standard” Chak add/trash mob and have been in combat for close to 30 minutes after that kill.
Basically, if you kill a mob where the wall to Dragon’s Stand is in Tangled Depths (as in it dies right on or right next to it within a maximum of about 20 units), you’d have to run till about halfway to the Ley-Line Confluence Waypoint (if you were on the waypoint looking to DS, it’d be the second pillar on the left, or the farthest one on the left depending on perspective).