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Gremlin, there should be a sniper (or someone else) standing near the walls; you attack them, and they throw you over the wall.
It's strange. I approach the creatures standing near the fences... the hero just walks up to them, and that's it. I put the mouse cursor right on them!!! The hero just walks up to them, and that's it! It's as if he has completed his task. Maybe a specific hero has to approach a specific wall? But it seems like a bug...