By the way, I know you said that you scumread Chemdah and thats partly (entirely?) why you didnt use your action on him. It IS important as town to trust your reads even if you dont think they will necessarily make sense to other people.
You should target Chemdah with your role anyways and here's why. Keep in mind even if you scumread someone, the chance of them being scum is still going to be like 60% or so unless you have REALLY strong reasons to see them as scum. Lets assume there is as 40% chance Chemdah is town. He is claiming a super OP role that nearly guarantees a guilty on someone. Since there is a 40% chance he's town, then there is a 40% chance you nearly secure a guilty result on scum by using your action on him. On the other hand, on the 60% chance hes scum, you still learn something by targeting him. If you target him, and he claims to be blocked (and/or receive no results) then you probably know hes lying. Sure there is a chance that you accidentally help him, but when you look at all the possible outcomes, its a net positive for town.
Im not trying to nitpick you. When you do post reads they are usually good. Even if you are ultimately wrong or change your mind, other people will help you get there by talking to you about your reads. Ive decided that Im going to engage with you until you start giving some opinions