In our School, taninzugake (or free form practice) is commonly practiced at the end of each class. This type of practice allows the nage to respond to the selected attack type by using any technique they so choose. The attack type in the video is yokomenuchi, which is a side blow to the head.
Yokomenuchi taninzugake forms part of the Aikido Yuishinkai grading syllabus for 1st kyu (brown belt) and dan (black belt) gradings.
Have a great week