"Sherlock," Bella says tightly, "you can't tell me someone threatened my father and stop there. What is the point of telling me anything at all if you're not going to give me enough information for it to be useful?"

Sherlock's anxiety about the situation is clearly real; it's practically pouring off him. Considering how few friends he has, and how people have noticed the fact that she has been friendly with him outside of their assigned roles in Biology class - she ate lunch outside yesterday to avoid a barrage of questions from Jessica once she realized that they had been seen leaving school ground together - it's not unreasonable that anyone wishing to get to Sherlock might target her or her family.

It has not occurred to her until now to think about the potential dangers of befriending the boy whom the world believes to be Tony Stark's brother.