Erich and Emrys had a long chat about what happened in the icy world, and who was responsible for the WRAITH's absolutely humiliating defeat. Emrys was just as outraged as Erich when he found out it was Echo who had betrayed the Empire. And thus he and Erich immediately took the warp gate back to the borders of the Germanic Star-Empire.
Where Emrys ordered the immediate arrest of Echo and the rest of Erich's team besides JT. After all, neither he nor Erich could be certain that Ghost and Heavy were not involved with the treasonous plot. While Ghost and Heavy were being interrogated by professionals. Erich arrived in front of Echo.