Nikolai allowed himself to be dragged along because what was the alternative? Yanking her back towards him and forcing her to walk like a sane person? That was the best possible way to get himself hit in the face or arrested, neither of which would be a good thing.
More pieces of the puzzle that was Sasha clicked into place and he thought he understood a bit better about why she was upset. "That's awful," he said, as though she didn't already know that. As though living it wasn't as bad as hearing it.
"We'll go to my place," he finally agreed, "but I'll take you home in the morning when you feel better, and if you want me to." He sped up his pace long enough to put a steadying arm around her shoulders. "Just slow down, please. It's not far to the Disapparation point and if you break your ankle on route, then I'll have no choice but to call your family."