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[Cager ref 1989]

See. That's what's wrong with us officials. We won't call it like it should be called. Just blow the whistle, hold up ten fingers, and get ready for the tongue lashing to begin. Just be proud you are the only one in the building who seems to know the rules.
That's like a coach who runs out onto the floor screaming at you for a call you made. Are you gonna tell him now get off the floor and quit saying those nasty things about me...please coach get off the floor you are making me look bad...please coach this is reeeeally getting out of hand.
NO. You will ring him up in a heartbeat. You will not beg him to get off the floor. If you do you will look like an idiot with no guts.
Just blow the whistle when it is warranted.
(I do agree that a preventative measure might be in order if the kid is just slow, but if he is deliberately delaying the game to catch his breath...ring him up.)