If you send your KD's army out in a wave, that's a calculated risk you take and you should be afforded zero artificial protection by the community. If two KD's are in an active hostile (hostile = both meters at hostile) than it's basically gentleman conduct to leave the hostile alone. Until that time, you are in that risk and you have to hope it works out for you.
Any other definition of hostile relies on incomplete information. Seeing a SN full of attack is about the only thing the *public* has to go on.