#4 from Hilton Head dribbled across the eighteen from left to right against #2 for Eastside. He attempts a shot and #2 semi blocks the shot. I think it was just a reaction from #15 from Eastside, but he sticks his left arm out. The ball hits his left front forearm and bounces right in front of him. Based on the video (WYFF video) #2 and #18 for Eastside look like they kind of know it was a handball.
They have the replay of all the games on the schsl.tv website. I guess you can make your own determination.