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Make it a few seconds to work out and you will still be able to kill them. This would be easier and more fair than to build in a penalty system.
This is game bug section for game bugs. You may want to do this on the suggestion section instead.
I just figured combat logging was not intended in Guild Wars 2, so I personally consider this a bug that needs some sort of fixing. So in my opinion it goes in both suggestions & bugs. I mean honestly, how many times did you res a downed/killed player in LA, this means they died in an instace/PvP/WvW and logged out.. I see it everyday. I also see people combat logging when I’m fighting them, personally it bugs me a lot.
I liked the dishonored system in GW1 pvp. Idk how that could be implemented into wvw. Maybe get dishonored if logging out mid-combat.
Easiest fix, add a countdown upon disconnect, in WvW only (about 10 seconds?). Thus the trick won’t work to avoid certain death. Note this is a serious issue due to effects triggering ‘on kill’ – it could become a major exploit.
Dishonor could easily cause trouble to players suffering frequent disconnects, effectively locking them out of pvp/wvw (pvp being particularly bad in my case due to the frequent maploads there… which is my main d/c risk).