When attacks unfold, what makes a person run towards danger?

Neuroscientists, psychologists and have-a-go heroes' themselves explain why it is about more than just instinct

As a knife-wielding terrorist wearing a fake suicide belt caused panic on London Bridge in 2019, Darryn Frost remembers entering a state of intense focus.

Having grabbed a decorative narwhal tusk from the wall of Fishmongers' Hall, the formerly shy civil servant zoned in on the danger and ran towards it, helping pin the attacker to the ground.