Based on Williams tweet about K-State coaches yelling "cheating mother-fers", I had to break down the handshake encounter.
My amateur lip-reading has Tang saying "I'm not accusing you" at the start of this video. Then he points toward the basket where the managers/floor sweepers sit and says something to the effect of "two kids (or guys?) under the basket". Then he makes that motion with his right hand that appears to mimic someone recording something on their phone and you can see he mouths the word "video", then he makes a texting motion and you can tell he says "texting" before pointing up higher into the stands.
So he thinks the managers are recording their huddle and texting it to... someone? Isn't one of the key features of a huddle is that no one can see inside of it? What video are they taking? And even if it were true, what could the managers possibly have captured and who could they be texting it to during the game? Seems incredibly bizarre and far-fetched. Also, imagine your head coach being worried about this DURING THE GAME. Loser behavior.