There was a hint about the commander. Two blows in a row, + broken ribs. A blow with an axe would have been different.
I didn't give any particular hints about Nera, except for the perfect act of villainy in the singular - she killed the most important figure for the city. But the role was figured out anyway, and the negativity was described in full.
It's a different matter that I messed up with the lizard's weapon, because it turns out the spear is a throwing weapon. Fortunately, there were other hints about the role.