Alright, now to Igiss and the admin team. It's not to hard a thing to add that little piece of invaluable information to the current rule set, is it? One thing that this whole discussion has demonstrated is that not only there isn't any hint of a rule regarding fleeing by other available methods other than those of "cruising away" and/or "docking", but also there isn't even a consensus as to what "fleeing" would be if it isn't by the aforementioned methods.
Just write it in the proper rule that additionally to cruising and docking, once you're out of scanners range (and please define if that's 10k+ or completely out of sight from the radars) you're out of the fight regardless.
I'm not proposing a new rule, as it seems that admins are already using that directive as a rule, the players just aren't aware of that (as far as the comprehensive rule set is concerned).
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On a side note, it's pretty easy to drift away from the furball if you're organizing a flight group. Many times have I flown in circles to write and instruct my group (assign targets, redefine groups after someone gets destroyed and the sort) to find that the fight has moved away from me some 2 - 3k while I was busy typing.
As much as smaller distances would cover any PvP situations, we must remember that there are still people that like to RP their encounters, even in the middle of a fight. From a fighter that may be easy to accomplish through circling, but when capitals are involved you need to get a bit out off the mess so you can write. That doesn't mean that one would be able to "escape" the fight. If people are in fact targeting a ship, it will never really be able to leave the fight. This would only apply to ships that aren't in fact targeted in a fight and as such would be able to create that distance. Also, ships would still not be able to cruise away or dock for that, since the rules already cover it. The scanners range is more than enough for that.