Take the knife out of his hand and you simply have a jiyuwaza or randori drill. I saw something similar on youtube where Steven Seagal had multiple attackers bull rush some poor soul in the middle. There's a bunch of explaining going on in the background. That's really all I see in the video. Don't see anything that would be classified as tanto work.
Here is the clip I was referring to. It's about 3 minutes in.