With trophies in his bag, he was about to hightail it out when he decided he needed to exact one more act of revenge on Marcus. To do this involved dropping his trousers. A measure of his darker, thoughtless side.
A mistake because his DNA was now at the scene of the crime.
Out of the back doors he went, stealthily, carrying machine and bag. A light was on in a window of a neighbouring flat. A figure was looking out. Had he been seen? Would he be followed?
He ran until he could run no more. Safe at Marcus's!