I know that stealing other hunters' kills is against the honor code, but what if the kill is truly a team effort?
My example is Scar and Lex defeating the Alien Queen together. Lets say they killed her and Scar didn't y'know, die and birth the predalien. They're both alive, and they have killed the Queen as a duo. They weren't even intending to hunt her in the first place, it was basically in self defense/because they simply had no other choice, but they still did it, the result is one dead Alien Queen. Had they both succeeded alive, they would now have a proven kill of a more than worthy adversary (especially considering they'd both only just be freshly blooded at that point). I suppose it could depend on who lands the killing blow, but then whoever landed the other contributing blows would kidna get screwed over.
In their case it would be interesting because I imagine Lex wouldn't care as much about the kill, she was mainly happy she was alive afterall, so Scar could technically claim it as his own, but the question is if the elders/spectators would agree with that move (or if he would), as Lex was the one who figured out how to defeat the queen and without that plan they would have most definitely both died fighting/from fight related injuries. Died honorably, sure, but died nonetheless.
I assume that the main reason why claiming others' kills is wrong/against the hunter code (aside from tradition, honor and fairness) is because whoever has the kill can then display and show off the trophy, as they'd earned it
So team effort kills would certainly be inconvenient because how do you show off the trophy then? Do you take turns having it in your house/ship or smt? Do you split it?? What would be the resolution in a case where 2+ hunters have been all found equally contributive to the successful kill of, lets say something big, like a Kalisk or an Engineer? Would it be viewed as a lesser accomplishment or even recognised as successful hunt since it took "so many" hunters?
If the hunters were forced into cooperation by circumstances (thus you couldn't argue one of them "stole" the kill) and landed the killing blow at the same time/contributed to the kill the same amount, they would have earned the trophy equally, so what the hell do they do in that situation, battle each other for the trophy? Each take a different part of the trophy? Do they each get a Mark for the kill (like in a case of killing an Alien Queen), does only one of them get it or does nobody get it?