when 2k is the range to consider "being in a battle" you can often forget about most bombers - or report/sanction them for re-engaging. - you easily drift 2k away. - and when the capital ship pilot is in a bad mood, he could just SS the bomber being a little over 2k away and coming back --> re-engaging.
i think a battle should be 10k. because you can only fly 10k from your target on purpose. - that means aswell that if a capital fights multiple enemies, that each one that leaves those 10k is considered retreatet, even if other members of the group are still engaged. - when it comes to re-engaging, every ship is a single unit.
but 2k.... no way. the zoner juggernaut is 2k long ...... allmost