The Birch (2016)

Tormented by Kris, the school's alpha male and fearsome bully, Shaun, a timid schoolboy, has endured one humiliation too many. As a result, on his grandmother's dying bed, a precious, yet odd keepsake is bestowed to Kris; one that promises to keep him safe in her absence. "She will look after you, protect you, just as I have always done.. just as she did for me", were her last words, however, what does grandma mean?