The aid was merely a simple illusion, making her look like Like, though. Nothing too major.
Also, the missing arm wasn't fresh as-of the final duel. He had medical care, and purposefully declined to have it re-attached because he could fight one-armed fine but reattaching it would require a longer period of recovery.
Originally posted by Vensai
Caedus could have tied Jaina but chose not to. Didn't she have backup when she attacked him?
Not when they were engaging each other.
And sure, he could've made it a draw, but she was also noted to be going recklessly on the offense since he had escaped before.
Once she had cut his achilles tendon, she could've played it safer and still won, but didn't. Admittedly, tactical blunder on her part.