It's a montage. The immediate executions (he put Stauffenberg's last) and scenes from the trials are cross-cut, so we go from Olbricht being shot to Witzleben on trial and Freissler ranting back to Stauffenberg, for example.

Have you ever seen the film of the trials Goebbels ordered but then decided not to show, because even to him it was obvious Freissler came off worse than the defendants?