Slide or avoid - USSSA league

[chuckfan1]

........."It is the base runner's responsibility to avoid contact with the fielder when he has the ball. Slide or avoid is in effect at all times when fielder is in possession of ball......"

That is from the USSSA website rules section.
It goes on to say if it is intentional, you may eject.
So....he didnt slide, and he didnt avoid. Sometimes ya just gotta umpire. Go with what you see, and if it looks like interference, to you, call it. You have the aforementioned rule reference to back you up.
Maybe in your scenario, call it. Without having seen the play, if you dont call it, it sets a precedent, at least for the rest of that game. The teams now think they may be able to go in like that on any play.
At that level, call that stuff early, USSSA being a youth league, has that safety stuff in place. And coach wont have much to argue your point with.