Axel had nothing else to do after his 'planned' lunch with Heaven. His initial plan of spending a day with his sister-in-law failed miserably. Thus, Axel ended up killing time tagging along with Tiger. Everyone was busy and Tiger was the only person whom Axel knew was available at the moment.
He went with Tiger as they made their rounds, checking each department as if they were supervisors or some sort. To be fair, this was actually one of Tiger's jobs to ensure that the building was safe from any form of danger. It's just that Bear or someone in the security unit would usually do it because Tiger was lazy. Moreover, Tiger was often with Dominic and Dominic was always out and about.
"This is crazy." Axel couldn't help but comment as they walked around the twentieth floor. "You mean you need to do this regularly?"