It’s too early to test a claim with a vig. Particularly on a weak case and on a Doc, no less. What if scum have a watcher? (They’ll know who the vig is.) What if scum have a target redirector? (They can switch another person as the vig’s target, who won’t be self-protecting. It’s like a bonus scum kill.) What if scum have a blocker? (They’ll prevent the doc from saving himself. It’s like a bonus scum kill.) There are all sorts of bad scenarios that can arise from having a vig go after a power role. Honestly, a lynch is better, because scum are less apt to be able to screw with the lynch. Vigging to test claims is something better left to mid and end game, when a lot of power roles (on both sides) are exposed or dead.