could someone post the vid of the play, at the game I thought it was a block, others texting me watching on Tv said he lowered his shoulder for the charge. Regardless it wasn't quite as egregious as the calls in the UNC game.
Such a grey area issue, but here's the bottom line...forever and a millennium in my time as a fan and refing back in the day the call blocking was made anytime a guy thrust himself in front of an offensive player and wasn't "set" or what looks like set. A close reading of the rules (as I did when CuseinVt supplied them here), suggests that is not the rule or case and virtually all "close" calls like this are charging if the guy gets in front if even only for only a millisecond (full speed or not, moving in space or not as long as the toes of the feet are down for that millisecond).
The ONLY time its a block from an explicit reading of the rules are if a defender thrusts himself in front of already airborn player, the defender is in the circle below the basket, or if a defender has himself "set" but then goes forward into that offensive player. That's it. Everything else is a charge is how the rules work.
That's not how its been called the past forever years though, that's for sure. And the confusion of it all is how these refs and the league (IMHO) act to continue to screw over these northern teams in our league or how a biased ref (uconsciously or not) continue to have an unfair negative effect on the games and game in general elsewhere.