Mayuri didn't pay attention at first when the Shinigami started following him. His reiatsu was obviously not far away behind him, which meant that the kid was probably following him, but right now he had more important things on his mind.
"What a bother" he thought again. "If this continues, than it will become very difficult to carry out further experiments on my precious test subjects, that I have prepared".
The Captain kept on walking.
Left,...
... right,...
...and straight again.
The first squad headquarters weren't far anymore when he suddenly stopped. Without turning around he said:
"Hey, you"...
"Stop being such a nuisance and tell me, why are you following me?"