We did want Goshikuro to have a student or even a few under his control. If he can cause depression and suicidal tendencies, it would make sense. We should probably make a list of his powers at some point to keep track of them and his plans. So the student under Goshi's control is in turn controlling the imps? 

And not injured, just a chance for Botan to use her spirit gun. It could even miss, but since she doesn't know what to do with her rose powers, it's all she has at the moment.