Ok, sounds like 2 aircraft going to the same place have ended up within 10 miles of each other or so. Thus the controller has him climb to 6000ft and maintain 220 knots, The ACA pilot suggests he would like to speed up, and is happy to stay at 6000ft but the Controller notes theyre going to the same place, so he actually needs to increase the distance between them. The ACA pilot then suggests he can change his final cruise altitude if he wants so they can get their speed up.
ATC then sais "Enough" I suspect he misunderstood that they were saying the same thing again... perhaps a better choise of words would have been "Standby"... this means to the pilot that ATC is 'working out weather that's acceptable', even if he's just sticking to the same plan and nothing has changed at the ATC end. This would likley keep the pilot happy that something was 'about to' happen. and means ATC can just go ahead and do what he was going to do anyway
This is ceartainly not a saftey issue at this point... it is when the ACA pilot spends upwards of 30 seconds asking for the tapes, ID and phone number. in at least 4 transmissions.
The only thing the controller did wrong was say "Ok that's enough" instead of "Standby". There were no seperation issue, indeed the reason there was not a problem with seperation was BECAUSE the controller held the ACA at 220 knots.
the only saftey related problems here seemed to be ACA spending so much time trying to get the information to report the non-existant incident. (that is to say "that's enough" used in place of "Standby")