Delay of game ?

[Chess Ref]

Fed rules. Visitors are on a little run to get back into game. They score again off a nice little pass and ensuing lay up. Kid who made the lay up has the ball drop in his lap and does the primal scream , slamming the ball down trick . Ball bounces almost to the roof. I come up with a delay of game warning. In hindsight any opinions on whether I should have or could have gone directly to a unsporting T ?