Bryan looked around the warehouse one more time, making sure that everybody was dead. Yet, he wasn't reassured with just a sweep of his gaze. Hence, he went around the warehouse, closely examining every dead person.
After completely making sure, he cast Shadow Concealment on himself and exited the warehouse. It had already been 30 minutes since the massacre had begun.
The maids and servants in Brown Manor must have definitely heard the loud commotion and called the police by now. Bryan still had to loot Jack's house, hence, he rushed to the manor, in the dark of night.
He had already changed into his back three-piece suit and a black trench coat before exiting the warehouse. Furthermore, he had also changed into different shoes. Or else, he would be leaving a trail of bloody footprints wherever he went.