These are three representations of the same form, Xingyi Quan - Pi Quan/ Splitting Fist, from of the Yi Zong School.
The first clip is Master Hong Yi Xiang performing Splitting Fist.
The second clip is teacher Su Dong Chen a student of Hong Yi Xiang.
The third clip is from Tang Shou Tao teacher Mike Patterson. Mr. Patterson was a student of Xu Hong Ji, a student of Hong Yi Xiang.
This is what I teach here at: Boulder Internal Arts