Hi there!
Our QA team tested Qui-Gon Jin's ability "Harmonious Assault" at level 8 (omega'd) and the assisting ally recovers 20% of their health. Perhaps the situation you may of had was with the assisting attack being dodged or the assisting ally having a healing immunity buff on them. Though @Apostilo 's suggestion is likely as well.
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Our QA team tested Qui-Gon Jin's ability "Harmonious Assault" at level 8 (omega'd) and the assisting ally recovers 20% of their health. Perhaps the situation you may of had was with the assisting attack being dodged or the assisting ally having a healing immunity buff on them. Though @Apostilo 's suggestion is likely as well.