Since you have movement available, I'm going to describe it as Corilo rolling out from the statue, firing his shots, and then darting back for cover. Either way, I think you would have hit even with the cover the statue is providing.
Just going to go ahead and roll the Bone Naga's concentration checks, since I know its stats for that.
Bone Naga Concentration Check1 (DC10) = [roll0]
Bone Naga Concentration Check2 (DC10) = [roll1]
Bone Naga Concentration Check3 (DC10) = [roll2]
Lorenzo will be free to move about the cabin on his turn due to the Bone Naga's loss of concentration.
I'll get updates done by late-morning and then it should ultimately be Gnorth's turn. There will likely be a zombie in Brue's face by then.