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Well, I think it's just a useless glitch... You still can't move during it.
And by the way, this happens not only when a hero ends his turn in a garrison... it happens anywhere...
If a hero is running on "penalty" terrain, he often has one or two steps left, but he can't move anywhere. In such cases, to prevent the message "heroes can still move" from popping up, I double-click the hero in any direction, and his "movement" is exhausted.
