Mark did not make his move at night, it would be foolish to do so when he had so many better chances to approach the lab. The best time would actually be the breakfast queue.
It was the time when he would be freed with his night shop duties so he would have a somewhat alibi for himself. He would not be a candidate anyway unless he did get caught but this way the risk was almost eliminated.
The other shopkeeper NPC soon came to replace him and Mark almost gave the other a once over.
This person was new, one he had not seen before but that was not unusual in itself. It was the lack of acknowledgement on the other's part which startled. He had not gotten such a response since long ago.
People tended to actually acknowledge him nowadays, even more so now that Kuro was not actually with him. The feline had taken to the training course like a duck to water, taking out her agitation on the dummies.