Um, I found a bug. Ok here's how it goes down.
Playing on Normal setting I was able to save the Van Braun and nothing happened no jumpout nothing, I tried it again while not moving and put on time compression and it worked fine. Von Braun blew up and got jumput message and it worked like normal. Unfortunately it was not that hard to save the Von Braun Here's how I did it:
Ship: Perseus like normal.
Weapons: 2x Prometheus + Tempest + Harpoon.
1) Ordered wingmen to protect rickenbocker.
2) Destroyed beam cannons on Rackshaza/Cain then destroyed them subsequently.
3) Ravana comes in at a distance of about 5 clicks out or so I put all energy to afterburners and made it to the Ravana and destroyed the two forward beams and a couple of other beams on it's spines under the belly.
3.5) Ordered wingmen to protect Von Braun
4) Demon warps in and I afterburn it over there and destroy the beams on the side facing the Von Braun.
5) Demon warps out at like 60% for some reason and Ravana is destroyed.
6)All enemies elimenated and volia, Von Braun/Rickenbocker saved. End result was rickenbocker was about 60% and Von Braun was about 35% . This was on the normal setting BTW so if it was easier it would probably be easier.