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A bug cannot be either fatal or non-fatal. It either is a bug or it isn't.
And the moderator was absolutely right when he pointed out that in the TTG on the Jester map, some players used a tactic involving a computer-controlled hero with around 10-12 archers, a horde of peasants, and 15 neutral druids. While the army's strength wasn't drastically different, as in the case of a fatal loss of a super-hero companion, no amount of morale or luck would allow winning this battle against the druids.