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. It is unclear why Frost went from bystander to “have-a-go hero”, much like Ahmed al-Ahmed, who wrestled a gun off one of the attackers on Sydney’s Bondi Beach on Sunday. When the London Bridge attack unfolded inside the hall on 29 November 2019, Frost said chaos and confusion took hold. “My vision went tunnel vision just on to him so anything in the periphery I couldn’t see at all, and what I could see was super-high detail like an 8K TV. It’s only the trauma side of it that really hurt me.”Larner, who was hailed the “Lion of London Bridge”, said he made a split-second decision to intervene.