Radik
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If you read this passage carefully, everything will fall into place.
Okay, rules are rules. You can argue, of course, but it's not that important. So, let's accept it as is.
But still, here's an example:
Let's say there are several AI opponents on the map, and at one point, one AI kills another AI (a well-developed hero, who is very important to you).
The rules don't prohibit buying the killed AI heroes. But at the same time, you didn't contribute to his death...
Radik