The defenses weren't just good, they were also different from most systems, but as the drone fell, Reaper smoothly inserted coding of its own into the system, taking over systems as the base code was pushed out and deleted where it could. With the jamming, no one should know what happened, and might assume a mechanical or programming fault had crashed it. Well before it crashed or got far from the AI's location, it had enough control to direct the drone back to it, so it could study it. Or rather, clear the installed systems, and hand it over to X1 and the others to study while Reaper went ahead to get more help. Once it turned over the latest load of scrap, the two mostly intact main programming cores from the stalkers, one possibly damaged stalker core, and the drone, it would head out and try to get news on how long they had been gone, and what the Companions were and had been doing.