This technique featuring Eyal Yanilov (from the IKMF P2 syllabus) is a very easy, yet effective technique.
According to the original video uploader, The meaning of the technique is that you defend with your front hand a straight punch delivered with the diagonal hand, as left vs. left. Send your palm diagonally forward to meet the attacking hand (better meet it at the wrist area). Then continue with a sweeping motion with the palm while sending the elbow forward and up. The elbow now serves as protection. Then in a fluent motion counterattack. First with a hammer punch sideways and then with other attacks as needed. Tactical finish should be done according to the situation.