Kyle
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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 useful to you).
The rules don't prohibit buying the defeated AI heroes. But at the same time, you didn't contribute to his defeat...
Кто состоянием своим доволен, тому жить весело. (с)Алекса́ндр Васи́льевич Суво́ров