Mixed Races

I was proofing a new map, 4 player, when I discovered the races begain producing each others units. I'm assuming that starts happening as each races is defeated but it wasn't a team play. I do remember reading something about it years ago. What's the 411 on that? Thnxs.

It is possible to modify any map as if they were regular mods (but with several limitations)
You can for example open the .kmp file with HPI viewer, extract it to a folder, modify or create a "canbuild" and "canbuildCB" directory and pack the folder back into a .kmp using HPI packer
canbuild and canbuildCB are the directories that define what units can build, as you can see if you open data.hpi, v3rocket.hpi or hpidata.hpi (canbuildCB being for Crusades Balance)
I've made some maps before in which you can build units from any other race but the limitation is that you can only build from a race if that race already exists on the map, for example, if one player picks Aramon and the other picks Taros, they won't be able to build anything from Veruna, Zhon or creon because these races weren't loaded in the map

So it could be that maybe

Here's the map if you are curious:

Spoiler:

https://mega.nz/#!ZU9BQbSb!AEBZfXFCxZzM4EbSc9by5bIyigjnp7DAUIJop37bfmE

Dummy me. Zhon was the culprit. It has a unit that can turn an enemy unit. I replayed the map and watched as massive turn attacks took place. It's a good strategy as it has the best of all races.