JV Girls game tonight. I am R in 3 whistle crew. Player A steals ball from Player B at midcourt and drives toward basket. Player B gets behind her and at the top of the key makes a weak attempt to trip her from behind. There was no contact whatsoever, so I (Lead) made no call. Coach complained to my partner who was T, but he did not see it. After thinking about it, I am not so sure I did the right thing. I thought maybe Unsporting Act, and wondered if it should be treated as a swing that did not connect? What do you think??