Дегустация Horn of the Abyss

Here's a situation from the game involving a dock: I position a unit with 1 attack against the last stack of neutral units, and it, the jerk, ignores the unit with 1 attack and runs towards a stack of level 1 units that can only reach it on the next turn. I haven't seen this happen in SoD. It happened in a battle against centaurs, and they were running towards a stack of imps.