You became new speedster, second in line to replace Jay, so now you work in his place while he is busy with his daily life. Alan probably should have worked with you earlier but he was too busy, some of league already know you and it seems even Bruce recommended you. Surprising.

Then Alan came to the place where you were patrolling, it seems, kicking asses of some random thieves, he appeared suddenly, so without looking around, you crashed right into him with enough speed that Alan himself leaned back slightly before straightening out. Is it just a speedster trait to be so inattentive...

— "I would prefer a handshake."

He says, shaking off his suit from the dust you produced while running around here.