Touch foul to stop clock

[Philz]

I was recently doing a Rec league game, NCAA rules when Team A leading got a rebound and a fast break. Player B1 reaches and barely touches the shorts and I mean "barley" with both hands of A1 to try and stop the clock but I dont call it and Team A scores easily on a 3 on 1 break. B1 goes nuts on my no call. I mentioned to him you must make and attempt for the ball. I could have called an intentional foul so I basically gave you break but your soft touch didnt seem to impeed offensive player and I'm not going to penalize them when they had a fast break going. His reply is "were not trying to hurt anyone out here just trying to stop the clock". I said you can make an attempt for the ball without hurting anyone. The next foul by team B was a head tackle on team A. Both benches empty. There was less than a minute left team A up by 9.....I called the game but was vebally abuised all the way to the parking lot. I gave this a lot of thought and one thing I could have done different was warn the team B coach when the game was getting down to the end and it was apparent that they would try and stop the clock with a foul is to make sure his players went for the ball. Any other suggestions?