NFHS - End of Game Situation

[Tio]

I wanted to solicit the thoughts of the NFHS officials in the group. I was evaluating a HS game last night for our local group.

Team A is behind 65-60. They score a 2 point basket with 3 seconds remaining and are now down 65-62. Team A is out of timeouts. Team B knows that with less than 5 seconds remaining, they do not need to inbound the ball and are making no attempt to do so. To stop the clock, A1 grabs the ball and runs off the court. What, if any ruling do you have? If you can find a caseplay, I would be grateful.

I only work NCAA and thankfully, with a stopped clock under one minute, this is not a situation I need to worry about.