They're both 6/7 and in the same class at school. This happened a few times over the last term and he threatened her again today. According to her he's variously threatened to kill or strangle her or her dad if she doesn't do what he says (like buy him sweets). Prior to this they were good friends, went to each other's birthday parties and he seemed a lovely little boy. I find it really troubling that he'd say such things but obviously my main concern is DD. I'm writing in to her class teacher; should I copy in the head as the lead safeguarding contact?