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No, I'm talking about the fight with one troll. For some reason, I thought that those 5 mana could be used effectively somewhere, but now there are no more saves. Then the fight becomes much easier.
I'm not sure about the cells; they are also blocked in the zone of der.Operator's influence (grass, rough). For mr.Fat, it seems that they are only blocked on grass, but not on swamp. For frifix and Boneman, they are not blocked (snow). For the hero without a name, they are blocked (grass). I haven't checked the rest. So, we can assume that they are blocked everywhere there is grass, and possibly also on rough terrain.