How would he feel if they tried the same thing with him, and he had an opportunity to assist the authorities, to bring these criminals into justice, and he did nothing about it? This is just a normal (present time) "second conditional" to me. The question asks how this person ("he") would feel now if a certain condition were true now .
New words, one handy idiom, and a 2-minute quiz — delivered to your inbox to keep your streak alive.