Surprisingly, both Kain and Serena were exempted from the first field assessment of the year—and it wasn't because the school had found out about Gabriel.
Rather, it was because, upon going over the debriefing reports provided to the college about their rescue of Cherry and the other children from the laboratory, some undisclosed high-up individual took notice of their abilities—specifically, Bea's ability to control the mind, and extract information directly from memories.
For Serena, they took notice of Balens' ability to deal with any and all manner of situations using the equivalent exchange skill.
And so, for the second time, Kain was assigned a Black Mission, but this time Serena would be his partner.
However, neither Kain nor Serena raised any objection or expressed any disagreement with taking the mission, even after knowing that it may take them away from their classes and Gabriel for an unknown amount of time.