I imported some animation i setuped combo and in one of those animations its jumping and hitting but when i do it its doing the animation but the legs not working he is not jumping i tried some things but dosent work how to fix it?

hello this is my problem
question: i imported some animation i setuped combo and in one of those animations its jumping and hitting but when i do it its doing the animation but the legs not working he is not jumping i tried some things but dosent work how to fix it?
please i need help
thanks