Players have been reporting an issue with being able to escape combat *very* quickly on both PvP servers and Battlegrounds, and then being able to join a Battlegrounds match while seemingly still in PvP combat (on Nagafen). After some discussion and diagnosis in this thread, Rothgar posted the backstory on the issue and presented a change that will be made to address the issue:

Prior to battlegrounds the only way you got out of combat was for your hate to degrade over time. So the more hate you built with someone, the longer you’d stay in combat.

When battleground development began, a new method was added to remove you from combat if you got far enough away from your attacker and hadn’t had any aggressive action with them in a period of time. (4 seconds) The aggressive action goes both ways, you attacking them or them attacking you.

This new check was enabled for all PvP, not just battlegrounds. We’re going to increase this timer from 4 to 10 seconds and see how that goes.

The old rule is still in effect. If your hate degrades to almost nothing, you’ll be removed from combat. But in addition, if you run 20 meters away and neither of you have attacked each other in 10 seconds, you’ll also be removed.