who tried to prevent the attack (roll the thunder hear my cry)

That would be Mr. Jamison. Mr. Jamison arrives in his car and tells them to take TJ to the sheriff. The sheriff arrives and says that Mr. Granger doesn't want a hanging on his place. Kaleb Wallace wants to take TJ elsewhere to hang him and mentions hanging Mr. Morrison, too. Someone else suggests Mr. Logan. There are cries for hangings as Mr. Jamison tries to shield TJ with his own body.

Thank youu :)