Today I came across this suggested edit from an anonymous user. The edit added a schematic to a question that was begging for one. At first I found that suspicious: how could an anonymous user know what circuit the OP was talking about, but then I studied the circuit a little and thought that the circuit was ok and the anonymous user was just being helpful. Then I saw that PeterJ rejected it, so I thought that maybe I had been fooled.
As a reviewer, how should I handle this and similar cases?
Should we just go in and rollback the edit (it's been approved now)?