What it means to step up in a crisis situation

Recent cases of ordinary Singaporeans stepping in during dangerous incidents have put citizen bravery in the spotlight. From tackling an armed attacker to helping strangers in distress, some people act before most of us have even worked out what’s happening. But when danger unfolds in front of you, is stepping in always the bravest or safest thing to do? Caitlin Ng looks at what drives that split-second choice.