in this case, Kai should highlight his cooperation skills, such as When a member of Kai's group fell behind, he helped her so the group would finish on schedule.
For interviewers ability to work in a team is extremely important since since companies tend to be separated into different departements whose function is correlated with one another. Helping others who is experiencing indicates that you are a team players and a valuable asset to the team.
Kai is interviewing for a job and the interviewer asks him for an example of his skill. In this case, Kai should highlight his cooperation skills, such as When a member of Kai's group fell behind, he helped her so the group would finish on schedule.