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Neither of the heroes has the Tactics skill. But in one case, the enemy hero DOESN'T deploy his troops; I reload the save, change the army's position, attack, and... he's already using the Tactics skill.
Here's the save file. **Hero Tazar attacks the red Sorcerer. Fast battle must be enabled.**
1. Attack without changes, don't agree with the results - Tactics is not used at all.
2. Change your army: move the angels to the archers' position.
Attack, the hero loses, don't run away, don't agree with the result, and replay. Sorcerer is already using Tactics.