Shadir took some time to go over the file on himself so he could become "better acquainted". After all, he certainly felt foreign in this body of his.  It didn't surprise him much that he had regeneration, he'd seen it in action already, but what did surprise him was that according to the file, his regeneration could even restore lost limbs.  Based on the data, his wing would regrow by the time they got to Mar Sara.  He looked over his shoulder, and indeed, his wing looked to be regenerating.