Theo had been neglecting his therapist's direction to go out and socialise since the rats had died. It had affected him more than he'd been prepared for and he hadn't gone into work for two days. He'd gone in today and had been confronted with a customer who caught his surname and caused a stink, speaking out forthrightly about the fact that he shouldn't be employed and that he should be in Azkaban by all rights. Theo knew that his father had done terrible things to other people during the war; this kind of reaction wasn't unusual and he had done nothing to defend himself. His boss had asked if he'd wanted to go home but he'd declined, finishing off with the animals and cleaning up before leaving. He didn't want to go out but he'd brought a book to return to the Corner with him and he didn't want to face his therapist to say that he'd started resorting to his hermit behaviour again.
He hadn't gone to get a drink this time, wanting to drop the book off and go, but seeing some poor guy kneeling down and clearing up what was clearly someone else's help pulled at the part of him that his dad had tried to first crush and then scour out of him, with no luck.