A checkpoint after the talks before the fight would have been a good idea. Since Dettlaff is able to one shot you with his bat attack, you get to see the events that happen then over and over again. They are quite important and really lose their emotional bearing once you've seen em 10 times.
When the fight between regis and dettlaff begins, the devs give you the opportunity to save your game. Then you walk towards them and there start only 2 sequences to skip everytime after you died.