[As surmised by Xeno Strike Force pilots tonight ...]
With Hadad now in meltdown, most of us are eager to get in on the action of clubbing the Orthruses that spawn non-stop from the Maw, especially since these are the last 72h of them being worth 40m a pop - before the giga-nerf of Tuesday (when they will be brought down to 15m a pop.)
We have just confirmed that patrols will aggro NPCs in the instance and "go active" as a result. Once patrols do go active, there is NO WAY to reset the instance to "peaceful" - the only way is to reset the instance by logging off en masse of switching to a different (blank slate) game mode.
If, however, you take the NPCs down BEFORE you start engaging Orthruses, and leave other interceptor variants alone, it is possible to shoot down retreating forces with (mostly - still need to deal with shutdown fields) impunity. Note: As you no longer need a TPN, do others a favor and bring an SFN instead - as it will protect others in the instance as well.
The NPCs are "lawless" so you will NOT incur a bounty for killing them.
Let's make the enemy retreat from Hadad a costly one.
Glory, to Mankind!
-- CMDR Mechan