I got some question about knight/renegade related.

1. How many knight/Renegade skill that capable to score a critical hit ?
2. How often Frenzy buff occur ?
3. Should I keep my single skill or change to Area? since all Renegade's skill are single, are 1st skill from knight still usefull?
4. About build, which the best to maximize first ? Vengeance+DeadCrash or DoubBreak ?
5. Care to explain hemmoherge and the damage?

Thanks for reading