Sometimes it is very obvious coz the battle is too easy. Someone will usually say "Hey! did you just kill so-and-so" and when asked "politely", the spoils of battle can be shared.
However, what does one do if you have a full battle, collect the spoils and then someone says "Hey, I was killing so-and-so - I want whatever they dropped". Sure it can lead to interesting role-play but in the end, what does one do - hand over the loot

