He might have saved lives standing outside the building but we cannot call him a Hero because he just did his duty for which he is being paid. A person can never be a Hero without Sacrifice. Apart from Sacrifice there must be certain qualities in a person that are considered to be heroic and makes him a hero. The qualities are honesty to pursue justice, patience and dedication to pursue goals, courage to face adversity, trustworthy for faith and conduct, endurance to tolerate pain in hardship. A hero should be willing to sacrifice their own life for greater good. He must have the ability to focus towards a particular purpose; for what he believe is right.
A hero has to take the initiative to solve a problem or help someone out. A hero doesnt always fight crime or always have an opposition. They dont even have to work with people; they could be designing a product that helps many people. The idea of how a Hero should be or what qualities in a person can be considered heroic has changed over time. These days the term Hero is being misused all the time. People playing cricket, baseball or other games are being called as heroes. But as the matter of fact they are just players that are being paid for their game. They are not sacrificing anything for anyone. For example, we can consider a player as a Hero when he sacrifices his kidney for someone who needs it, knowing that he probably might never play again makes him a Hero.
According to me Mother Theresa who sacrificed her whole life to serve others, Marie Curie who invented Radium which ultimately led to her death are Heroes. Its not that they havent left with any choices that they have to sacrifice their lives. They made the choices and came forward to do what they believed, out of which many people were helped. A true hero always inspires and influences people around him, they give the proof that nothing is impossible if you just dream, believe and achieve with conviction and perseverance.