For the last mission that CS can easily be explained

The reason you just appear outside is because the scene is over. It's like when a person gets stabbed and they die, do you see the part where they just lay dead and bleed out to the last point or does it cut to the next day where the cops find the body or someone passing by

In the same sense the scene was over Darnus showed his hands the heroes are on the floor defeated and he left them be. All that could be added to that scene is everyone standing up and walking away defeated and do you really want to see your character walk away from the battlefield in defeat? It's an unnecessary scene that would take away from the overall "badass" tone potrayed by the General.
It would be like those overexcessive scenes they have in Family Guy at times when Peter hurts his knee and he holds it aching in pain for at least 30 seconds before it cuts to the next scene, it's just not worth the time to show the heroes doing anything unless they were going to try and attack Dranus but that wasn't the case, that was the end of the scene.