Sakaizawa was shoved off the dohyo duing the matta, but I didn't think he was hurt, then. It certainly was had enough shove, that he went off the dohyo, but he was on his feet.
After the restart, when Sakaizawa was pushed back with his feet planted, the rest of his body laying on top of his own legs, with his knees bent as for as it could... and then some, I believe his breath was knocked out of him. Then once when he could breathe, he rolled and rolled until he got to the edge of the dohyo, where they put him in a wheel chair to take him out. It looked like he was in so much pain, even on the wheeel chair, that he couldn't even sit up straight. ;-)
I hope he will be OK, but it sure didn't look like it, to me! (Shaking head...)