Kathleen and Sam got back three hours later. Sam was asleep.
Sam was a trooper in the emergency room, and waited the two hours in the emergency room with nary a cry.
Evidently Sam had needed one subdural stitch, which is a layer of fat and muscle under the skin. He also needed five exterior stitches. So it was a very deep cut, but other than that not a serious injury. All is well.
After the stitches were put in, he pretty much fell asleep/passed out before the nurse could get back.
I tried to explain to PJ and Anna why they need to be careful when rough-housing with your siblings, and I restrained my knee jerk reaction, which was to slap PJ in the face and say loudly "In this house we don't hurt each other!"